After a GPU reset the amdgpu SMU can return a constant garbage reading
(observed: 511°C = 0x1FF invalid-ADC, with nonsense voltage/fan values).
The thermal supervisor believed it, paused the radeon engine and
escalated to SIGSTOP — freezing a healthy card forever. Both readers
(engine-side thermal.py and the front's supervisor loop) now discard
readings ≥150°C with a one-time warning naming the broken sensor;
thermal protection for that card resumes when it reads sane values.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014S8VtAvG499SsCbeESRK7V