chore(release): v0.43.0

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -5,6 +5,31 @@ All notable changes to RigDoctor are recorded here. Format follows
 (`MAJOR.MINOR.PATCH`, pre-1.0). `__version__` and `pyproject.toml` must match the git
 release tag (so the auto-updater, D18, can compare versions).
 
+## [0.43.0] - 2026-05-29
+### Added
+- **GPU stress test + close thermal monitoring** (`rigdoctor stress`, and a "Stress test…" button
+  on System Health). Runs a GPU load and samples sensors at a high rate (default 0.5 s), then
+  reports per-metric min/avg/**peak**, how long the core spent above each temperature threshold,
+  power vs the limit, throttling (decoded from the NVML clocks-event bitmask), and any GPU **fault**
+  (Xid / VA-space freeze / a query-timeout hang) that hit during the window — the on-demand way to
+  reproduce load-correlated crashes. The load comes from an explicit `--command` (a game or a tool
+  like gpu-burn), an auto-detected loader (gpu-burn/vkmark/glmark2/vkcube), or **monitor-only** when
+  none is found (you launch the game; it tracks temps while you play).
+- **Drive health & wear in the health report.** A new `core/drives.py` parses the full
+  `smartctl --json` for every drive into prioritized findings: the SMART verdict, a derived
+  **life-left %** (NVMe `percentage_used` or the SATA wear-leveling attribute), **power-on hours**,
+  data written (TBW), temperature, and the early-failure predictors (reallocated / pending /
+  offline-uncorrectable sectors, NVMe media errors, low available spare). Replaces the old
+  pass/fail-only SMART check; flows through the same elevated path (GUI launch / `sudo rigdoctor
+  report`), degrading to per-drive "needs root" notes unprivileged.
+
+### Fixed
+- **GUI "Add game…" can now link a launcher.** The dialog only asked for a name, so a custom
+  game (e.g. SPT) couldn't be given its launch command or log folder from the app — those were
+  CLI-only, leaving it unlaunchable from the GUI. It's now a proper form: name + an optional
+  launch command/script (with a **Browse…** file picker) + an optional log folder (auto-detected
+  from the script's folder when left blank).
+
 ## [0.42.0] - 2026-05-29
 ### Added
 - **Detect hard freezes that log no Xid.** The kernel-log scanner caught Xid codes, OOM, panic,

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "rigdoctor"
-version = "0.42.0"
+version = "0.43.0"
 description = "Modular hardware monitoring & crash diagnostics for Linux gamers."
 readme = "README.md"
 requires-python = ">=3.11"

src/rigdoctor/__init__.py

@@ -1,3 +1,3 @@
 """RigDoctor — modular hardware monitoring & crash diagnostics for Linux gamers."""
 
-__version__ = "0.42.0"
+__version__ = "0.43.0"

src/rigdoctor/cli.py

@@ -298,10 +298,10 @@ def cmd_collect_priv(args) -> int:
     """Internal: emit root-only data (SMART + dmidecode) as JSON, run via pkexec at launch."""
     from dataclasses import asdict
 
-    from .core.health import check_smart
+    from .core import drives
     from .core.inventory import _dmidecode
 
-    data = {"smart": [asdict(f) for f in check_smart()], "dmidecode": _dmidecode()}
+    data = {"drives": [asdict(d) for d in drives.collect()], "dmidecode": _dmidecode()}
     print(json.dumps(data))
     return 0
 
@@ -640,6 +640,47 @@ def cmd_games_remove(args) -> int:
     return 1
 
 
+def cmd_stress(args) -> int:
+    import shlex as _shlex
+
+    from .core import stress
+    from .render import format_raw, render_stress
+
+    command = _shlex.split(args.command) if args.command else None
+    if not args.json:
+        loaders = stress.available_loaders()
+        if command:
+            print(f"Stressing with: {' '.join(command)}")
+        elif loaders:
+            print(f"Stressing with auto-detected loader: {loaders[0]}")
+        else:
+            print("No GPU load tool found and no --command given — MONITOR-ONLY mode.")
+            print(f"  Launch the game/app now; I'll closely track temps for up to {int(args.duration)}s.")
+        print(f"  Sampling every {args.interval:g}s. Press Ctrl-C to stop early.\n")
+
+    def _tick(sample, elapsed) -> None:
+        by = {r.key: r for r in sample.readings}
+        bits = [f"{elapsed:5.0f}s"]
+        for key, tag in (("gpu.temp", "core"), ("gpu.power", "pwr"),
+                         ("gpu.util", "util"), ("gpu.clock.core", "clk")):
+            r = by.get(key)
+            if r is not None and r.value is not None:
+                bits.append(f"{tag} {format_raw(r.value, r.unit)}")
+        print("  " + "   ".join(bits) + "        ", end="\r", flush=True)
+
+    result = stress.run(duration=args.duration, interval=args.interval, command=command,
+                        on_tick=None if args.json else _tick)
+    if not args.json:
+        print()  # end the live line
+
+    if args.json:
+        from dataclasses import asdict
+        print(json.dumps(asdict(result), indent=2, ensure_ascii=False))
+    else:
+        print(render_stress(result))
+    return 0 if result.severity in ("ok", "info") else 1
+
+
 def build_parser() -> argparse.ArgumentParser:
     p = argparse.ArgumentParser(
         prog="rigdoctor",
@@ -657,6 +698,14 @@ def build_parser() -> argparse.ArgumentParser:
     mp.add_argument("--plain", action="store_true", help="plain redraw instead of the curses UI")
     mp.set_defaults(func=cmd_monitor)
 
+    st = sub.add_parser("stress", help="GPU stress + close thermal monitoring (repro load crashes)")
+    st.add_argument("-d", "--duration", type=float, default=120.0, help="run for this many seconds (default 120)")
+    st.add_argument("-n", "--interval", type=float, default=0.5, help="sampling interval in seconds (default 0.5)")
+    st.add_argument("--command", default=None,
+                    help="load generator to run (e.g. a game or 'gpu-burn 60'); omit to auto-detect or monitor-only")
+    st.add_argument("--json", action="store_true", help="output JSON")
+    st.set_defaults(func=cmd_stress)
+
     sub.add_parser("gui", help="launch the desktop GUI (needs PySide6)").set_defaults(func=cmd_gui)
     sub.add_parser("sources", help="list detected sensor sources").set_defaults(func=cmd_sources)
 

src/rigdoctor/core/drives.py

@@ -0,0 +1,229 @@
+"""Drive health & wear (M-drives): per-disk SMART stats parsed from smartctl JSON.
+
+Unlike a GPU, storage exposes a real health/wear story, so this reads it in full: the overall
+SMART verdict, a derived **life-left %** (NVMe ``percentage_used`` or the SATA wear-leveling
+attribute), **power-on hours** (the drive's runtime), data written (TBW), temperature, and the
+early-failure predictors (reallocated / pending / offline-uncorrectable sectors, NVMe media
+errors, available spare). Turned into prioritized health findings.
+
+smartctl needs root, so collection runs through the same elevated path as the other root-only
+checks (``rigdoctor collect-priv`` via pkexec at GUI launch, or ``sudo rigdoctor report``).
+Parsing is JSON-based (smartctl ``--json``), which is stable across drive types. Stdlib only;
+degrades gracefully — no smartctl, no root, or an unparseable device yields an info finding.
+"""
+
+from __future__ import annotations
+
+import json
+import shutil
+import subprocess
+from dataclasses import dataclass
+
+from .health import CRITICAL, INFO, OK, WARNING, Finding
+
+# NVMe writes are counted in 512-KB "data units"; 1 unit = 1000 * 512 bytes.
+_NVME_UNIT_BYTES = 512_000
+_LBA_BYTES = 512  # SATA Total_LBAs_Written counts 512-byte sectors
+
+
+@dataclass
+class DriveHealth:
+    device: str
+    model: str = ""
+    kind: str = ""                  # "nvme" | "sata" | "scsi"
+    passed: bool | None = None      # SMART overall verdict; None if unknown / needs root
+    needs_root: bool = False
+    health_pct: int | None = None   # derived life-left %
+    percent_used: int | None = None # NVMe wear used %
+    power_on_hours: int | None = None
+    temp_c: int | None = None
+    data_written_tb: float | None = None
+    reallocated: int | None = None  # SATA reallocated sectors (id 5)
+    pending: int | None = None      # SATA current-pending sectors (id 197)
+    offline_uncorrectable: int | None = None  # SATA id 198
+    available_spare: int | None = None        # NVMe %
+    available_spare_threshold: int | None = None
+    media_errors: int | None = None           # NVMe
+
+
+# --- collection (root) ----------------------------------------------------------------
+
+def _scan_devices() -> list[str]:
+    try:
+        proc = subprocess.run(["smartctl", "--scan"], capture_output=True, text=True, timeout=10)
+    except (subprocess.SubprocessError, OSError):
+        return []
+    return [ln.split()[0] for ln in proc.stdout.splitlines() if ln.strip().startswith("/dev/")]
+
+
+def _smartctl_json(device: str) -> dict | None:
+    try:
+        proc = subprocess.run(
+            ["smartctl", "--json=c", "-H", "-A", "-i", device],
+            capture_output=True, text=True, timeout=20,
+        )
+    except (subprocess.SubprocessError, OSError):
+        return None
+    try:
+        return json.loads(proc.stdout)
+    except (ValueError, TypeError):
+        return None
+
+
+def _ata_attr(data: dict, attr_id: int) -> int | None:
+    for row in data.get("ata_smart_attributes", {}).get("table", []):
+        if row.get("id") == attr_id:
+            raw = row.get("raw", {})
+            return raw.get("value")
+    return None
+
+
+def _ata_norm_value(data: dict, attr_id: int) -> int | None:
+    """The normalized 'value' (100→0 life indicator) for an ATA attribute."""
+    for row in data.get("ata_smart_attributes", {}).get("table", []):
+        if row.get("id") == attr_id:
+            return row.get("value")
+    return None
+
+
+def parse(device: str, data: dict | None) -> DriveHealth:
+    """Build a DriveHealth from smartctl JSON (pure-ish; no IO of its own)."""
+    d = DriveHealth(device=device)
+    if not data:
+        d.needs_root = True
+        return d
+
+    d.model = data.get("model_name") or data.get("scsi_model_name") or ""
+    proto = (data.get("device", {}).get("protocol") or "").lower()
+    d.kind = "nvme" if "nvme" in proto else ("sata" if "ata" in proto else (proto or ""))
+
+    status = data.get("smart_status")
+    if isinstance(status, dict) and "passed" in status:
+        d.passed = bool(status["passed"])
+    else:
+        # No verdict and a non-zero exit usually means we couldn't open the device (needs root).
+        if data.get("smartctl", {}).get("exit_status", 0) and not status:
+            d.needs_root = True
+
+    temp = data.get("temperature", {}).get("current")
+    d.temp_c = int(temp) if isinstance(temp, (int, float)) else None
+    poh = data.get("power_on_time", {}).get("hours")
+    d.power_on_hours = int(poh) if isinstance(poh, (int, float)) else None
+
+    if d.kind == "nvme":
+        log = data.get("nvme_smart_health_information_log", {})
+        d.percent_used = log.get("percentage_used")
+        d.available_spare = log.get("available_spare")
+        d.available_spare_threshold = log.get("available_spare_threshold")
+        d.media_errors = log.get("media_errors")
+        if d.temp_c is None and isinstance(log.get("temperature"), (int, float)):
+            d.temp_c = int(log["temperature"])
+        units = log.get("data_units_written")
+        if isinstance(units, (int, float)):
+            d.data_written_tb = round(units * _NVME_UNIT_BYTES / 1e12, 2)
+        if isinstance(d.percent_used, (int, float)):
+            d.health_pct = max(0, 100 - int(d.percent_used))
+    else:  # SATA / ATA
+        d.reallocated = _ata_attr(data, 5)
+        d.pending = _ata_attr(data, 197)
+        d.offline_uncorrectable = _ata_attr(data, 198)
+        lbas = _ata_attr(data, 241)  # Total_LBAs_Written
+        if isinstance(lbas, (int, float)) and lbas > 0:
+            d.data_written_tb = round(lbas * _LBA_BYTES / 1e12, 2)
+        wear = _ata_norm_value(data, 177)  # Wear_Leveling_Count (Samsung): normalized = life left
+        if wear is None:
+            wear = _ata_norm_value(data, 231)  # SSD_Life_Left on some drives
+        if isinstance(wear, int):
+            d.health_pct = wear
+    return d
+
+
+def collect() -> list[DriveHealth]:
+    """Per-drive health for every SMART-capable device (needs root for real data)."""
+    if shutil.which("smartctl") is None:
+        return []
+    return [parse(dev, _smartctl_json(dev)) for dev in _scan_devices()]
+
+
+def from_dicts(rows: list[dict]) -> list[DriveHealth]:
+    """Rebuild DriveHealth objects from the privileged collector's JSON."""
+    out: list[DriveHealth] = []
+    for r in rows:
+        if isinstance(r, dict) and r.get("device"):
+            fields = {k: r.get(k) for k in DriveHealth.__dataclass_fields__}
+            out.append(DriveHealth(**fields))
+    return out
+
+
+# --- findings -------------------------------------------------------------------------
+
+def _stats_line(d: DriveHealth) -> str:
+    parts: list[str] = []
+    if d.health_pct is not None:
+        parts.append(f"{d.health_pct}% life left")
+    elif d.percent_used is not None:
+        parts.append(f"{d.percent_used}% used")
+    if d.power_on_hours is not None:
+        parts.append(f"{d.power_on_hours:,} h powered on")
+    if d.data_written_tb is not None:
+        parts.append(f"{d.data_written_tb:g} TB written")
+    if d.temp_c is not None:
+        parts.append(f"{d.temp_c}°C")
+    if d.available_spare is not None:
+        parts.append(f"spare {d.available_spare}%")
+    return " · ".join(parts)
+
+
+def to_findings(drives: list[DriveHealth]) -> list[Finding]:
+    if not drives:
+        if shutil.which("smartctl") is None:
+            return [Finding(INFO, "Storage", "SMART not checked (smartmontools missing)",
+                            "Disk self-health couldn't be read.",
+                            "Install it: `sudo apt install smartmontools`")]
+        return []
+    findings: list[Finding] = []
+    for d in drives:
+        name = d.model or d.device
+        if d.needs_root:
+            findings.append(Finding(INFO, "Storage", f"{name}: SMART needs root",
+                                    "Reading drive health requires elevated access.",
+                                    "Run: `sudo rigdoctor report` (or launch the GUI, which asks once)."))
+            continue
+
+        stats = _stats_line(d)
+        # Severity from the failure predictors, worst first.
+        bad = []
+        if d.passed is False:
+            bad.append("SMART overall self-assessment FAILED")
+        for label, val in (("reallocated sectors", d.reallocated),
+                           ("pending sectors", d.pending),
+                           ("offline-uncorrectable sectors", d.offline_uncorrectable),
+                           ("NVMe media errors", d.media_errors)):
+            if isinstance(val, int) and val > 0:
+                bad.append(f"{val} {label}")
+        spare_low = (isinstance(d.available_spare, int) and isinstance(d.available_spare_threshold, int)
+                     and d.available_spare < d.available_spare_threshold)
+        worn = isinstance(d.percent_used, int) and d.percent_used >= 90
+        hot = isinstance(d.temp_c, int) and d.temp_c >= 70
+
+        if d.passed is False or bad:
+            findings.append(Finding(
+                CRITICAL, "Storage", f"{name}: failing ({stats})" if stats else f"{name}: failing",
+                "; ".join(bad) + ".",
+                "Back up this drive now and plan to replace it."))
+        elif spare_low or worn:
+            findings.append(Finding(
+                WARNING, "Storage", f"{name}: worn ({stats})",
+                ("Available spare below the drive's threshold." if spare_low else
+                 f"NVMe wear at {d.percent_used}% used — near end of rated life."),
+                "Back up important data and budget for a replacement."))
+        elif hot:
+            findings.append(Finding(
+                WARNING, "Storage", f"{name}: hot ({stats})",
+                f"Drive temperature is {d.temp_c}°C.",
+                "Improve case/M.2 airflow; sustained heat shortens SSD life."))
+        else:
+            findings.append(Finding(
+                OK, "Storage", f"{name}: healthy" + (f" ({stats})" if stats else ""),
+                "SMART self-assessment passed." if d.passed else ""))
+    return findings

src/rigdoctor/core/health.py

@@ -260,47 +260,19 @@ def check_nvidia_module() -> list[Finding]:
     )]
 
 
-def _smart_devices() -> list[str]:
-    try:
-        proc = subprocess.run(["smartctl", "--scan"], capture_output=True, text=True, timeout=10)
-    except (subprocess.SubprocessError, OSError):
-        return []
-    devices = []
-    for line in proc.stdout.splitlines():
-        line = line.strip()
-        if line.startswith("/dev/"):
-            devices.append(line.split()[0])
-    return devices
+def check_drives() -> list[Finding]:
+    """Per-drive SMART health + wear/runtime stats (see core/drives.py).
 
+    Uses the session's elevated collection when present (GUI launch / pkexec), else reads
+    smartctl directly — which only returns real data as root, so the unprivileged case yields
+    'needs root' info findings pointing at `sudo rigdoctor report`.
+    """
+    from . import drives, elevation
 
-def check_smart() -> list[Finding]:
-    if shutil.which("smartctl") is None:
-        return [Finding(
-            INFO, "Storage", "SMART not checked (smartmontools missing)",
-            "Disk self-health couldn't be read.",
-            "Install it for disk health checks: `sudo apt install smartmontools`",
-        )]
-    devices = _smart_devices()
-    if not devices:
-        return [Finding(
-            INFO, "Storage", "SMART: couldn't enumerate drives",
-            "Reading SMART usually needs root.",
-            "Run: `sudo rigdoctor report`",
-        )]
-    findings: list[Finding] = []
-    for dev in devices:
-        try:
-            proc = subprocess.run(["smartctl", "-H", dev], capture_output=True, text=True, timeout=15)
-        except (subprocess.SubprocessError, OSError):
-            continue
-        combined = proc.stdout + proc.stderr
-        if "Permission denied" in combined or "requires root" in combined.lower():
-            findings.append(Finding(INFO, "Storage", f"SMART for {dev} needs root", "", "Run: `sudo rigdoctor report`"))
-        elif "PASSED" in combined:
-            findings.append(Finding(OK, "Storage", f"SMART OK: {dev}", "Overall-health self-assessment passed."))
-        elif "FAILED" in combined or "FAILING_NOW" in combined:
-            findings.append(Finding(CRITICAL, "Storage", f"SMART FAILED: {dev}", "The drive reports failing health.", "Back up now and replace the drive."))
-    return findings
+    priv = elevation.privileged()
+    if priv is not None and priv.get("drives") is not None:
+        return drives.to_findings(drives.from_dicts(priv["drives"]))
+    return drives.to_findings(drives.collect())
 
 
 def check_live_temps() -> list[Finding]:
@@ -398,25 +370,19 @@ def check_memory_speed() -> list[Finding]:
 def run_health_checks(include_journal: bool = True) -> list[Finding]:
     """Run all checks and return findings sorted by severity (worst first).
 
-    SMART needs root; if the session collected it via launch elevation, use that
-    instead of re-running smartctl (which would just report "needs root").
+    Drive SMART and RAM speed need root; if the session collected them via launch elevation,
+    those checks use the cached data instead of re-running (which would just report "needs root").
 
     `include_journal=False` skips the 7-day kernel-journal scan — used by the crash
     analysis, which scans the previous (crashed) boot specifically instead.
     """
-    from . import elevation
-
     findings: list[Finding] = []
     findings += check_nvidia_driver()
     findings += check_nvidia_module()
     if include_journal:
         findings += check_journal()
     findings += check_journal_persistence()
-    priv = elevation.privileged()
-    if priv is not None and priv.get("smart") is not None:
-        findings += [Finding(**d) for d in priv["smart"]]
-    else:
-        findings += check_smart()
+    findings += check_drives()
     findings += check_live_temps()
     findings += check_pcie_links()
     findings += check_displays()

src/rigdoctor/core/stress.py

@@ -0,0 +1,322 @@
+"""GPU stress + close thermal monitoring — the repro tool for load-correlated crashes.
+
+Run a GPU load and sample sensors at a high rate, then report peak/sustained temperatures,
+how long the GPU spent above each temperature threshold, power headroom vs the limit, whether
+it throttled, and any GPU fault (Xid / VA-space / a query timeout) that hit during the window.
+This is the on-demand way to reproduce the "only under load / only certain games" freezes
+instead of waiting for a game to trigger them.
+
+The load comes from, in order: an explicit ``command`` (your game, or a loader like gpu-burn),
+an auto-detected loader on PATH (gpu-burn / vkmark / glmark2 / vkcube), or **monitor-only** when
+none is found — then you generate the load yourself (launch the game) while this closely tracks
+temps for the duration.
+
+Stdlib only. Degrades gracefully: no nvidia-smi → no GPU stats; a loader that won't start →
+monitor-only with a note; missing journal access → no fault scan, just the telemetry.
+"""
+
+from __future__ import annotations
+
+import shutil
+import subprocess
+import time
+from collections.abc import Callable
+from dataclasses import dataclass, field
+
+from . import health
+from .sample import Sample
+from .sampler import Sampler
+from .sources import available_sources
+
+# Default temperature dwell thresholds (°C). 83 is Ampere's typical thermal-throttle point;
+# 90+ is hot; sustained 95+ on the core (or 100+ on GDDR6 memory) is a cooling problem.
+DEFAULT_THRESHOLDS = (80, 85, 90, 95)
+
+# Known GPU load generators, best (heaviest / most deterministic) first. argv builder takes the
+# remaining duration so a self-terminating loader (gpu-burn) bounds itself; the windowed
+# benchmarks loop until we kill them. None are required — detection is best-effort.
+_LOADERS: list[tuple[str, Callable[[float], list[str]]]] = [
+    ("gpu-burn", lambda secs: ["gpu-burn", str(max(1, int(secs)))]),
+    ("vkmark", lambda _s: ["vkmark", "--run-forever"]),
+    ("glmark2", lambda _s: ["glmark2", "--run-forever"]),
+    ("vkcube", lambda _s: ["vkcube"]),
+]
+
+# NVML clocks-event bits that mean the clocks are being *held back* (a throttle), decoded from
+# the active-reasons bitmask so we don't depend on per-field name differences across drivers.
+_THROTTLE_BITS = {
+    0x008: "HW slowdown",
+    0x020: "SW thermal slowdown",
+    0x040: "HW thermal slowdown",
+    0x080: "HW power-brake slowdown",
+}
+_POWERCAP_BIT = 0x004  # hitting the power limit — expected under load, reported separately
+
+
+@dataclass
+class MetricStat:
+    key: str          # e.g. "gpu.temp", "gpu.power", "gpu.clock.core"
+    label: str        # human label for the report
+    unit: str
+    min: float
+    avg: float
+    max: float
+    samples: int
+
+
+@dataclass
+class _Tick:
+    dt: float                    # seconds this tick represents (for dwell-time weighting)
+    values: dict[str, float]     # reading key -> value across all sources (Nones dropped)
+    throttle: list[str]          # active throttle reasons this tick
+    power_capped: bool
+    lost: bool                   # query timeout / no GPU response this tick
+
+
+@dataclass
+class StressResult:
+    load: str                       # "command: …" | "auto: gpu-burn" | "monitor-only"
+    duration: float                 # seconds actually monitored
+    samples: int
+    interval: float
+    stats: list[MetricStat] = field(default_factory=list)
+    peak_temp: float | None = None
+    peak_mem_temp: float | None = None
+    avg_temp: float | None = None
+    time_above: dict[int, float] = field(default_factory=dict)  # threshold °C -> seconds at/above
+    max_power: float | None = None
+    power_limit: float | None = None
+    power_capped: bool = False
+    throttled: bool = False
+    throttle_reasons: list[str] = field(default_factory=list)
+    gpu_lost: bool = False
+    faults: list[str] = field(default_factory=list)             # Xid/VA-space titles in the window
+    aborted: bool = False                                        # Ctrl-C or the load exited early
+    severity: str = health.OK
+    verdict: str = ""
+
+
+# --- load resolution ------------------------------------------------------------------
+
+def available_loaders() -> list[str]:
+    """Known GPU load tools found on PATH (heaviest first)."""
+    return [name for name, _ in _LOADERS if shutil.which(name)]
+
+
+def _start_load(command: list[str] | None, duration: float) -> tuple[subprocess.Popen | None, str]:
+    """Start the load process and return (proc, description). proc is None for monitor-only."""
+    if command:
+        try:
+            proc = subprocess.Popen(command, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+            return proc, "command: " + " ".join(command)
+        except (OSError, ValueError) as exc:
+            return None, f"monitor-only (command failed to start: {exc})"
+    for name, build in _LOADERS:
+        if shutil.which(name):
+            try:
+                proc = subprocess.Popen(build(duration), stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+                return proc, f"auto: {name}"
+            except (OSError, ValueError):
+                continue
+    return None, "monitor-only"
+
+
+def _stop_load(proc: subprocess.Popen | None) -> None:
+    if proc is None or proc.poll() is not None:
+        return
+    proc.terminate()
+    try:
+        proc.wait(timeout=5)
+    except subprocess.TimeoutExpired:
+        proc.kill()
+
+
+# --- throttle / fault probes ----------------------------------------------------------
+
+def _throttle_state() -> tuple[list[str], bool]:
+    """(active throttle reasons, power-capped) decoded from the clocks-event bitmask."""
+    if shutil.which("nvidia-smi") is None:
+        return [], False
+    raw = ""
+    for field_name in ("clocks_event_reasons.active", "clocks_throttle_reasons.active"):
+        try:
+            proc = subprocess.run(
+                ["nvidia-smi", f"--query-gpu={field_name}", "--format=csv,noheader"],
+                capture_output=True, text=True, timeout=5,
+            )
+        except (subprocess.SubprocessError, OSError):
+            continue
+        raw = proc.stdout.strip().splitlines()[0].strip() if proc.stdout.strip() else ""
+        if raw and raw.lower() not in ("n/a", "not supported", "[n/a]"):
+            break
+    try:
+        bits = int(raw, 16)
+    except ValueError:
+        return [], False
+    reasons = [name for bit, name in _THROTTLE_BITS.items() if bits & bit]
+    return reasons, bool(bits & _POWERCAP_BIT)
+
+
+def _faults_since(start_ts: float) -> list[str]:
+    """Titles of GPU/PCIe/hardware faults logged to the kernel journal since the run began."""
+    out = health._journalctl(["-k", "--no-pager", "-o", "cat", "--since", f"@{int(start_ts)}"])
+    if not out:
+        return []
+    return [f.title for f in health.scan_journal_text(out)
+            if f.category in ("GPU", "PCIe", "Hardware", "Kernel")]
+
+
+def _tick_values(sample: Sample) -> tuple[dict[str, float], bool]:
+    """Reading key -> value across all sources (Nones dropped), plus whether the GPU
+    failed to respond (an nvidia-smi query timeout — a hang/lost signal)."""
+    values: dict[str, float] = {}
+    lost = False
+    for r in sample.readings:
+        if r.source == "gpu" and r.metric == "status" and r.label == "query-timeout":
+            lost = True
+        if r.value is not None:
+            values[r.key] = r.value
+    return values, lost
+
+
+# --- pure analysis (unit-testable, no IO) ---------------------------------------------
+
+_REPORT_KEYS = {
+    "gpu.temp": ("GPU core temp", "°C"),
+    "gpu.temp.memory": ("GPU memory temp", "°C"),
+    "gpu.power": ("GPU power", "W"),
+    "gpu.util": ("GPU utilization", "%"),
+    "gpu.mem_util": ("VRAM controller util", "%"),
+    "gpu.clock.core": ("Core clock", "MHz"),
+    "gpu.clock.memory": ("Memory clock", "MHz"),
+    "gpu.fan": ("Fan", "%"),
+    "gpu.mem_used": ("VRAM used", "MiB"),
+    "cpu.temp": ("CPU temp", "°C"),
+}
+
+
+def summarize(ticks: list[_Tick], *, load: str, interval: float, faults: list[str],
+              thresholds=DEFAULT_THRESHOLDS) -> StressResult:
+    """Build a StressResult from collected ticks — pure, so it's tested with synthetic input."""
+    duration = sum(t.dt for t in ticks)
+    result = StressResult(load=load, duration=round(duration, 1), samples=len(ticks),
+                          interval=interval, faults=faults)
+
+    series: dict[str, list[float]] = {}
+    throttle_seen: set[str] = set()
+    time_above = {th: 0.0 for th in thresholds}
+    for t in ticks:
+        for key, value in t.values.items():
+            series.setdefault(key, []).append(value)
+        throttle_seen.update(t.throttle)
+        if t.power_capped:
+            result.power_capped = True
+        if t.lost:
+            result.gpu_lost = True
+        core = t.values.get("gpu.temp")
+        if core is not None:
+            for th in thresholds:
+                if core >= th:
+                    time_above[th] += t.dt
+
+    for key, (label, unit) in _REPORT_KEYS.items():
+        vals = series.get(key)
+        if not vals:
+            continue
+        stat = MetricStat(key, label, unit, round(min(vals), 1),
+                          round(sum(vals) / len(vals), 1), round(max(vals), 1), len(vals))
+        result.stats.append(stat)
+        if key == "gpu.temp":
+            result.peak_temp, result.avg_temp = stat.max, stat.avg
+        elif key == "gpu.temp.memory":
+            result.peak_mem_temp = stat.max
+        elif key == "gpu.power":
+            result.max_power = stat.max
+
+    # power_limit isn't a reported metric (it's ~constant); pull it from the raw series.
+    if "gpu.power_limit" in series:
+        result.power_limit = max(series["gpu.power_limit"])
+
+    result.throttle_reasons = sorted(throttle_seen)
+    result.throttled = bool(throttle_seen)
+    result.time_above = {th: round(secs, 1) for th, secs in time_above.items() if secs > 0}
+
+    _verdict(result)
+    return result
+
+
+def _verdict(r: StressResult) -> None:
+    """Set severity + a plain-language conclusion from the gathered signals."""
+    peak = f"{r.peak_temp:.0f}°C" if r.peak_temp is not None else "?"
+    if r.gpu_lost or any(t for t in r.faults):
+        r.severity = health.CRITICAL
+        cause = "; ".join(r.faults) if r.faults else "the GPU stopped responding (query timeout)"
+        r.verdict = (f"GPU fault during the stress run: {cause}. This reproduces the crash under "
+                     f"load — capture/keep these logs. Peak core temp {peak}.")
+        return
+    if r.throttled:
+        r.severity = health.WARNING
+        r.verdict = (f"Thermal/HW throttling detected ({', '.join(r.throttle_reasons)}) — the GPU "
+                     f"held clocks back to stay safe. Peak core temp {peak}. Improve cooling/airflow.")
+        return
+    if r.peak_temp is not None and r.peak_temp >= 90:
+        r.severity = health.WARNING
+        r.verdict = (f"No fault, but the core peaked at {peak} — hot. Watch GDDR6/VRM cooling; "
+                     "sustained high temps shorten the card's life and precede instability.")
+        return
+    if r.peak_temp is None:
+        r.severity = health.INFO
+        r.verdict = "No GPU telemetry was captured (nvidia-smi unavailable?)."
+        return
+    capped = " (power-limited — hitting the cap, which is normal)" if r.power_capped else ""
+    r.verdict = f"Stable: peaked at {peak} with no faults or throttling{capped}."
+
+
+# --- the run loop (IO) ----------------------------------------------------------------
+
+def run(duration: float = 120.0, interval: float = 0.5, command: list[str] | None = None,
+        thresholds=DEFAULT_THRESHOLDS, on_tick: Callable[[Sample, float], None] | None = None,
+        should_stop: Callable[[], bool] | None = None) -> StressResult:
+    """Drive a GPU load for ``duration`` seconds, sampling every ``interval``, and report.
+
+    Stops early on Ctrl-C, if a GPU query times out (likely hang), if the load process exits, or
+    when ``should_stop()`` returns True (the GUI's Stop button). ``on_tick(sample, elapsed)`` is
+    called each tick for live display.
+    """
+    sampler = Sampler(available_sources())
+    proc, load_desc = _start_load(command, duration)
+    start = time.monotonic()
+    start_ts = time.time()
+    ticks: list[_Tick] = []
+    last = start
+    aborted = False
+    try:
+        while True:
+            sample = sampler.sample()
+            now = time.monotonic()
+            dt = now - last
+            last = now
+            values, lost = _tick_values(sample)
+            reasons, capped = _throttle_state()
+            ticks.append(_Tick(dt=dt, values=values, throttle=reasons, power_capped=capped, lost=lost))
+            if on_tick is not None:
+                on_tick(sample, now - start)
+            if lost:  # GPU stopped responding — stop now, it may be hung/lost
+                break
+            if should_stop is not None and should_stop():  # GUI Stop button
+                aborted = True
+                break
+            if proc is not None and proc.poll() is not None:  # the load finished/exited
+                break
+            if (now - start) >= duration:
+                break
+            time.sleep(max(0.0, interval - (time.monotonic() - now)))
+    except KeyboardInterrupt:
+        aborted = True
+    finally:
+        _stop_load(proc)
+
+    faults = _faults_since(start_ts)
+    result = summarize(ticks, load=load_desc, interval=interval, faults=faults, thresholds=thresholds)
+    result.aborted = aborted or (proc is not None and command is not None and result.duration < duration - interval)
+    return result

src/rigdoctor/gui/games_page.py

@@ -430,19 +430,78 @@ class GamesPage(QWidget):
         self._banner.hide()
 
     def _add_custom_game(self) -> None:
-        """Manually add a game no launcher reports (e.g. SPT), then rescan to show it."""
-        from PySide6.QtWidgets import QInputDialog
-
+        """Manually add a game no launcher reports (e.g. SPT): name + an optional launch
+        command/script (so it can be launched under crash-capture) and log folder."""
         from ..core import customgames
 
-        name, ok = QInputDialog.getText(
-            self, "Add game", "Game name (e.g. SPT) — for titles no launcher reports:")
-        if not ok:
+        dlg = QDialog(self)
+        dlg.setWindowTitle("Add game")
+        dlg.setMinimumWidth(560)
+        v = QVBoxLayout(dlg)
+        v.setContentsMargins(20, 18, 20, 16)
+        v.setSpacing(10)
+
+        intro = QLabel(
+            "Add a game no launcher reports — a standalone mod launcher like SPT, an itch.io "
+            "download, or any hand-installed game.")
+        intro.setWordWrap(True)
+        v.addWidget(intro)
+
+        name_edit = QLineEdit()
+        name_edit.setPlaceholderText("SPT")
+        v.addWidget(QLabel("Game name"))
+        v.addWidget(name_edit)
+
+        cmd_edit = QLineEdit()
+        cmd_edit.setPlaceholderText("e.g. /run/media/.../Escape-From-Tarkov/tarkov.sh")
+        cmd_row = QHBoxLayout()
+        cmd_row.addWidget(cmd_edit, 1)
+        cmd_browse = QPushButton("Browse…")
+        cmd_row.addWidget(cmd_browse, 0)
+        v.addWidget(QLabel("Launch command / script (optional — enables launch + auto-capture)"))
+        v.addLayout(cmd_row)
+
+        log_edit = QLineEdit()
+        log_edit.setPlaceholderText("auto-detected from the script's folder (its logs/ subfolder)")
+        log_row = QHBoxLayout()
+        log_row.addWidget(log_edit, 1)
+        log_browse = QPushButton("Browse…")
+        log_row.addWidget(log_browse, 0)
+        v.addWidget(QLabel("Log folder (optional — read into crash diagnostics)"))
+        v.addLayout(log_row)
+
+        def _pick_command() -> None:
+            path, _ = QFileDialog.getOpenFileName(dlg, "Select the launch script/executable")
+            if path:
+                cmd_edit.setText(path)
+
+        def _pick_logdir() -> None:
+            path = QFileDialog.getExistingDirectory(dlg, "Select the game's log folder")
+            if path:
+                log_edit.setText(path)
+
+        cmd_browse.clicked.connect(_pick_command)
+        log_browse.clicked.connect(_pick_logdir)
+
+        buttons = QHBoxLayout()
+        buttons.addStretch(1)
+        cancel = QPushButton("Cancel")
+        cancel.clicked.connect(dlg.reject)
+        buttons.addWidget(cancel)
+        add = QPushButton("Add")
+        add.setObjectName("PrimaryButton")
+        add.setDefault(True)
+        add.clicked.connect(dlg.accept)
+        buttons.addWidget(add)
+        v.addLayout(buttons)
+
+        if dlg.exec() != QDialog.DialogCode.Accepted:
             return
-        name = name.strip()
+        name = name_edit.text().strip()
         if not name:
             return
-        if customgames.add(name):
+        if customgames.add(name, command=cmd_edit.text().strip() or None,
+                           logdir=log_edit.text().strip() or None):
             self.refresh()
         else:
             QMessageBox.information(self, "Add game", f"'{name}' is already in your games.")

src/rigdoctor/gui/health_page.py

@@ -39,6 +39,9 @@ class HealthPage(QWidget):
         self._status = QLabel("")
         self._status.setObjectName("Muted")
         header.addWidget(self._status)
+        self._stress_btn = QPushButton("Stress test…")
+        self._stress_btn.clicked.connect(self._open_stress)
+        header.addWidget(self._stress_btn)
         self._run_btn = QPushButton("Run health report")
         self._run_btn.setObjectName("PrimaryButton")
         self._run_btn.clicked.connect(self._run)
@@ -59,6 +62,11 @@ class HealthPage(QWidget):
 
         QTimer.singleShot(300, self._run)  # auto-run shortly after the window opens
 
+    def _open_stress(self) -> None:
+        from .stress_dialog import StressDialog
+
+        StressDialog(self).exec()
+
     def _run(self) -> None:
         self._run_btn.setEnabled(False)
         self._status.setText("Scanning logs, SMART, and driver…")

src/rigdoctor/gui/stress_dialog.py

@@ -0,0 +1,157 @@
+"""GPU stress + thermal-monitor dialog (GUI front-end for core/stress.py).
+
+Runs the stress monitor in a background thread, streams a live one-line readout, and shows the
+rendered result (telemetry stats + verdict) when it finishes. A Stop button ends the run early
+via a cooperative flag; closing the dialog mid-run stops it too.
+"""
+
+from __future__ import annotations
+
+import threading
+
+from PySide6.QtCore import Qt, Signal
+from PySide6.QtGui import QFont
+from PySide6.QtWidgets import (
+    QDialog,
+    QHBoxLayout,
+    QLabel,
+    QLineEdit,
+    QPushButton,
+    QSpinBox,
+    QTextEdit,
+    QVBoxLayout,
+)
+
+
+class StressDialog(QDialog):
+    _tick = Signal(str)      # live one-line readout (worker thread -> GUI)
+    _done = Signal(object)   # stress.StressResult when the run finishes
+
+    def __init__(self, parent=None) -> None:
+        super().__init__(parent)
+        self._stop = threading.Event()
+        self._running = False
+        self._tick.connect(self._on_tick)
+        self._done.connect(self._on_done)
+        self.setWindowTitle("GPU stress + thermal monitor")
+        self.resize(640, 460)
+
+        root = QVBoxLayout(self)
+        root.setContentsMargins(20, 18, 20, 16)
+        root.setSpacing(12)
+
+        intro = QLabel(
+            "Run a GPU load and closely watch temps. Reports peak/sustained temps, time spent "
+            "hot, throttling, and any GPU fault (Xid / driver freeze) during the run.")
+        intro.setWordWrap(True)
+        root.addWidget(intro)
+
+        from ..core import stress
+        loaders = stress.available_loaders()
+        self._mode = QLabel(
+            f"Load tool detected: {loaders[0]} — it'll drive the load." if loaders else
+            "No GPU load tool installed → MONITOR-ONLY: start this, then launch your game; "
+            "it tracks temps while you play. (Or give a command below.)")
+        self._mode.setObjectName("Muted")
+        self._mode.setWordWrap(True)
+        root.addWidget(self._mode)
+
+        form = QHBoxLayout()
+        form.addWidget(QLabel("Duration (s):"))
+        self._duration = QSpinBox()
+        self._duration.setRange(5, 3600)
+        self._duration.setValue(120)
+        form.addWidget(self._duration)
+        form.addSpacing(12)
+        form.addWidget(QLabel("Command (optional):"))
+        self._command = QLineEdit()
+        self._command.setPlaceholderText("e.g. /…/tarkov.sh  or  gpu-burn 60")
+        form.addWidget(self._command, 1)
+        root.addLayout(form)
+
+        self._live = QLabel("—")
+        self._live.setFont(QFont("monospace"))
+        self._live.setStyleSheet("background: #0d0f13; color: #cfd3da; border: 1px solid #2a2f39; "
+                                 "border-radius: 8px; padding: 8px;")
+        root.addWidget(self._live)
+
+        self._report = QTextEdit()
+        self._report.setReadOnly(True)
+        self._report.setFont(QFont("monospace"))
+        self._report.setVisible(False)
+        root.addWidget(self._report, 1)
+
+        buttons = QHBoxLayout()
+        buttons.addStretch(1)
+        self._stop_btn = QPushButton("Stop")
+        self._stop_btn.setEnabled(False)
+        self._stop_btn.clicked.connect(self._on_stop)
+        buttons.addWidget(self._stop_btn)
+        self._start_btn = QPushButton("Start")
+        self._start_btn.setObjectName("PrimaryButton")
+        self._start_btn.clicked.connect(self._on_start)
+        buttons.addWidget(self._start_btn)
+        root.addLayout(buttons)
+
+    def _on_start(self) -> None:
+        if self._running:
+            return
+        self._running = True
+        self._stop.clear()
+        self._start_btn.setEnabled(False)
+        self._stop_btn.setEnabled(True)
+        self._report.setVisible(False)
+        self._live.setText("starting…")
+        duration = float(self._duration.value())
+        command_text = self._command.text().strip()
+        threading.Thread(target=self._work, args=(duration, command_text), daemon=True).start()
+
+    def _work(self, duration: float, command_text: str) -> None:
+        import shlex
+
+        from ..core import stress
+
+        command = shlex.split(command_text) if command_text else None
+
+        def _tick(sample, elapsed) -> None:
+            by = {r.key: r for r in sample.readings}
+            from ..render import format_raw
+            bits = [f"{elapsed:5.0f}s"]
+            for key, tag in (("gpu.temp", "core"), ("gpu.power", "pwr"),
+                             ("gpu.util", "util"), ("gpu.clock.core", "clk"),
+                             ("gpu.temp.memory", "vram")):
+                r = by.get(key)
+                if r is not None and r.value is not None:
+                    bits.append(f"{tag} {format_raw(r.value, r.unit)}")
+            self._tick.emit("   ".join(bits))
+
+        try:
+            result = stress.run(duration=duration, interval=0.5, command=command,
+                                on_tick=_tick, should_stop=self._stop.is_set)
+        except Exception as exc:  # never let a worker crash take down the dialog
+            result = exc
+        self._done.emit(result)
+
+    def _on_tick(self, text: str) -> None:
+        self._live.setText(text)
+
+    def _on_done(self, result) -> None:
+        from ..render import render_stress
+
+        self._running = False
+        self._start_btn.setEnabled(True)
+        self._stop_btn.setEnabled(False)
+        if isinstance(result, Exception):
+            self._report.setPlainText(f"Stress run failed: {result}")
+        else:
+            self._report.setPlainText(render_stress(result))
+        self._report.setVisible(True)
+
+    def _on_stop(self) -> None:
+        self._stop.set()
+        self._stop_btn.setEnabled(False)
+        self._live.setText("stopping…")
+
+    def closeEvent(self, event) -> None:  # stop the run if the dialog is closed mid-flight
+        self._stop.set()
+        super().closeEvent(event)

src/rigdoctor/render.py

@@ -118,6 +118,32 @@ def render_health(findings: list, title: str = "Health report") -> str:
     return "\n".join(lines).rstrip()
 
 
+def render_stress(result) -> str:
+    """Render a stress.StressResult: telemetry stats, temp dwell time, and the verdict."""
+    lines = ["GPU stress + thermal monitor", ""]
+    lines.append(f"  Load     : {result.load}")
+    lines.append(f"  Duration : {_fmt_duration(result.duration)}  ·  {result.samples} samples "
+                 f"@ {result.interval:g}s" + ("  (stopped early)" if result.aborted else ""))
+    if result.stats:
+        lines += ["", f"  {'Metric':<22}{'min':>12}{'avg':>12}{'max':>12}"]
+        for s in result.stats:
+            u = s.unit
+            lines.append(f"  {s.label:<22}{format_raw(s.min, u):>12}{format_raw(s.avg, u):>12}"
+                         f"{format_raw(s.max, u):>12}")
+    if result.time_above:
+        spans = "  ".join(f"≥{th}°C: {_fmt_duration(secs)}" for th, secs in sorted(result.time_above.items()))
+        lines += ["", f"  Time at temp (core):  {spans}"]
+    if result.max_power is not None and result.power_limit:
+        cap = "  — hit the power cap" if result.power_capped else ""
+        lines.append(f"  Power peak: {result.max_power:.0f} W of {result.power_limit:.0f} W limit{cap}")
+    if result.throttle_reasons:
+        lines.append(f"  Throttling: {', '.join(result.throttle_reasons)}")
+    if result.faults:
+        lines.append(f"  Faults   : {'; '.join(result.faults)}")
+    lines += ["", f"[{_SEV_LABEL.get(result.severity, '?')}] {result.verdict}"]
+    return "\n".join(lines)
+
+
 def render_summary(summary: Summary, log_path=None) -> str:
     if summary.samples == 0 and not summary.events:
         where = f" ({log_path})" if log_path else ""

tests/test_drives.py

@@ -0,0 +1,99 @@
+"""Tests for drive health parsing & findings (synthetic smartctl JSON)."""
+
+import unittest
+from dataclasses import asdict
+
+from rigdoctor.core import drives
+from rigdoctor.core.health import CRITICAL, INFO, OK, WARNING
+
+_NVME_OK = {
+    "model_name": "Samsung SSD 980 PRO 1TB",
+    "device": {"protocol": "NVMe"},
+    "smart_status": {"passed": True},
+    "temperature": {"current": 41},
+    "power_on_time": {"hours": 1234},
+    "nvme_smart_health_information_log": {
+        "percentage_used": 3, "available_spare": 100, "available_spare_threshold": 10,
+        "media_errors": 0, "data_units_written": 200_000_000,  # ~102 TB
+    },
+}
+
+_NVME_WORN = {
+    "model_name": "Worn NVMe",
+    "device": {"protocol": "NVMe"},
+    "smart_status": {"passed": True},
+    "nvme_smart_health_information_log": {"percentage_used": 96, "available_spare": 100,
+                                          "available_spare_threshold": 10},
+}
+
+_SATA_FAILING = {
+    "model_name": "Samsung SSD 870 QVO 1TB",
+    "device": {"protocol": "ATA"},
+    "smart_status": {"passed": False},
+    "temperature": {"current": 35},
+    "power_on_time": {"hours": 5000},
+    "ata_smart_attributes": {"table": [
+        {"id": 5, "name": "Reallocated_Sector_Ct", "value": 80, "raw": {"value": 12}},
+        {"id": 177, "name": "Wear_Leveling_Count", "value": 88, "raw": {"value": 300}},
+        {"id": 241, "name": "Total_LBAs_Written", "value": 99, "raw": {"value": 2_000_000_000}},
+    ]},
+}
+
+
+class ParseTests(unittest.TestCase):
+    def test_nvme_parse(self):
+        d = drives.parse("/dev/nvme0", _NVME_OK)
+        self.assertEqual(d.kind, "nvme")
+        self.assertTrue(d.passed)
+        self.assertEqual(d.percent_used, 3)
+        self.assertEqual(d.health_pct, 97)          # 100 - percentage_used
+        self.assertEqual(d.power_on_hours, 1234)
+        self.assertEqual(d.temp_c, 41)
+        self.assertAlmostEqual(d.data_written_tb, 102.4, places=1)
+
+    def test_sata_parse(self):
+        d = drives.parse("/dev/sda", _SATA_FAILING)
+        self.assertEqual(d.kind, "sata")
+        self.assertFalse(d.passed)
+        self.assertEqual(d.reallocated, 12)         # raw value
+        self.assertEqual(d.health_pct, 88)          # normalized wear-leveling value
+        self.assertAlmostEqual(d.data_written_tb, 1.02, places=1)
+
+    def test_needs_root_when_no_data(self):
+        d = drives.parse("/dev/sda", None)
+        self.assertTrue(d.needs_root)
+
+    def test_roundtrip_through_dicts(self):
+        d = drives.parse("/dev/nvme0", _NVME_OK)
+        back = drives.from_dicts([asdict(d)])
+        self.assertEqual(len(back), 1)
+        self.assertEqual(back[0].model, d.model)
+        self.assertEqual(back[0].health_pct, d.health_pct)
+
+
+class FindingTests(unittest.TestCase):
+    def test_healthy_nvme_is_ok_with_stats(self):
+        f = drives.to_findings([drives.parse("/dev/nvme0", _NVME_OK)])[0]
+        self.assertEqual(f.severity, OK)
+        self.assertIn("97% life left", f.title)
+        self.assertIn("1,234 h", f.title)
+
+    def test_failing_sata_is_critical(self):
+        f = drives.to_findings([drives.parse("/dev/sda", _SATA_FAILING)])[0]
+        self.assertEqual(f.severity, CRITICAL)
+        self.assertIn("FAILED", f.detail)
+        self.assertIn("reallocated sectors", f.detail)
+
+    def test_worn_nvme_is_warning(self):
+        f = drives.to_findings([drives.parse("/dev/nvme1", _NVME_WORN)])[0]
+        self.assertEqual(f.severity, WARNING)
+        self.assertIn("worn", f.title)
+
+    def test_needs_root_is_info(self):
+        f = drives.to_findings([drives.parse("/dev/sda", None)])[0]
+        self.assertEqual(f.severity, INFO)
+        self.assertIn("needs root", f.title)
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/test_stress.py

@@ -0,0 +1,77 @@
+"""Tests for the GPU stress + thermal-monitor analysis (synthetic ticks, no real GPU)."""
+
+import unittest
+
+from rigdoctor.core import stress
+from rigdoctor.core.health import CRITICAL, OK, WARNING
+
+
+def _tick(temp=None, power=None, throttle=(), capped=False, lost=False, dt=1.0, **extra):
+    values = {}
+    if temp is not None:
+        values["gpu.temp"] = temp
+    if power is not None:
+        values["gpu.power"] = power
+    values.update(extra)
+    return stress._Tick(dt=dt, values=values, throttle=list(throttle), power_capped=capped, lost=lost)
+
+
+class SummarizeTests(unittest.TestCase):
+    def test_stable_run_is_ok(self):
+        ticks = [_tick(temp=t, power=200, **{"gpu.power_limit": 280}) for t in (60, 65, 70, 72)]
+        r = stress.summarize(ticks, load="monitor-only", interval=1.0, faults=[])
+        self.assertEqual(r.severity, OK)
+        self.assertEqual(r.peak_temp, 72)
+        self.assertEqual(r.max_power, 200)
+        self.assertEqual(r.power_limit, 280)
+        self.assertFalse(r.throttled)
+        self.assertIn("Stable", r.verdict)
+
+    def test_dwell_time_above_thresholds(self):
+        # 3 ticks of 2s each at 82/86/92 °C → ≥80 for all 6s, ≥85 for 4s, ≥90 for 2s.
+        ticks = [_tick(temp=82, dt=2.0), _tick(temp=86, dt=2.0), _tick(temp=92, dt=2.0)]
+        r = stress.summarize(ticks, load="x", interval=2.0, faults=[])
+        self.assertEqual(r.time_above[80], 6.0)
+        self.assertEqual(r.time_above[85], 4.0)
+        self.assertEqual(r.time_above[90], 2.0)
+        self.assertNotIn(95, r.time_above)  # never reached → omitted
+
+    def test_throttling_is_a_warning(self):
+        ticks = [_tick(temp=88, throttle=["HW thermal slowdown"])]
+        r = stress.summarize(ticks, load="x", interval=1.0, faults=[])
+        self.assertEqual(r.severity, WARNING)
+        self.assertTrue(r.throttled)
+        self.assertIn("HW thermal slowdown", r.throttle_reasons)
+
+    def test_high_temp_without_throttle_is_a_warning(self):
+        r = stress.summarize([_tick(temp=93)], load="x", interval=1.0, faults=[])
+        self.assertEqual(r.severity, WARNING)
+        self.assertIn("hot", r.verdict.lower())
+
+    def test_gpu_lost_is_critical(self):
+        ticks = [_tick(temp=70), _tick(lost=True)]
+        r = stress.summarize(ticks, load="x", interval=1.0, faults=[])
+        self.assertEqual(r.severity, CRITICAL)
+        self.assertTrue(r.gpu_lost)
+
+    def test_journal_fault_is_critical(self):
+        r = stress.summarize([_tick(temp=70)], load="x", interval=1.0,
+                             faults=["NVIDIA Xid 79 ×1"])
+        self.assertEqual(r.severity, CRITICAL)
+        self.assertIn("Xid 79", r.verdict)
+
+    def test_no_telemetry_is_info(self):
+        r = stress.summarize([_tick()], load="monitor-only", interval=1.0, faults=[])
+        self.assertEqual(r.severity, "info")
+        self.assertIsNone(r.peak_temp)
+
+
+class ThrottleDecodeTests(unittest.TestCase):
+    def test_throttle_bits_map_to_reasons(self):
+        # the constants used by _throttle_state decode the NVML active-reasons bitmask
+        self.assertIn("HW thermal slowdown", stress._THROTTLE_BITS.values())
+        self.assertIn("SW thermal slowdown", stress._THROTTLE_BITS.values())
+
+
+if __name__ == "__main__":
+    unittest.main()