[Bug 110394] Skylake GPU HANG while gstreamer H264 vaapi encoding from MJPEG vaapi decode on drm-tip

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110394

--- Comment #16 from Chris Wilson <chris at chris-wilson.co.uk> ---
Busy power consumption will be unaffected, semi-active power consumption will
be unaffected (that uses rc6 for short sleeps while active). Idle (GPU) power
consumption will be affected (off the top of my head, it prevents saving the
last 100mW). The rapl interface provides power consumption information (see
https://gitlab.freedesktop.org/drm/igt-gpu-tools/blob/master/lib/igt_gpu_power.c
for an example)

All 7 GPU error states indicate that it failed before reloading the same
context after a short idling -- the IPEHR (last command parsed) is the last
command in the retiring context. RING_TAIL (every time) is garbage -- whether
that is just the forcewake failing... probably.

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