[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 #44 from Andy Nicholas <andy.nicholas at shield.ai> ---
(In reply to Andy Nicholas from comment #41)
> Created attachment 144005 [details]
> GPU hang 13 - after media encoder power gating ONLY enabled
> 
> At least 3 compute sticks died when run in this configuration and I uploaded
> #12 previously. 
> 
> +               gen9_disable_rc6(dev_priv);
> +
> +               I915_WRITE(GEN9_PG_ENABLE,
> +                          GEN9_MEDIA_PG_ENABLE);
> 
> This particular crash had a huge amount of information dumped, so I figured
> I should upload it also.
> 
> Interestingly, the compute stick which usually has its GPU hang for all
> these tests is still running strong after 839 iterations.
> 
> I am about to test the opposite power gate and see if the render power gate
> ON while media power gate is OFF has any effect.

Yes, 4 of 8 compute sticks crashed by this morning, so it appears that having
either media or render power gating enabled ends up with GPU hanging.

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