[Bug 102774] [BDW] [Bisected] Absolute constant buffers break VAAPI in mpv

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102774

--- Comment #7 from Kenneth Graunke <kenneth at whitecape.org> ---
So, trying with Mesa 17.1 on Kabylake...mpv renders black with a theora video,
GPU hangs immediately with a VC1 video, and with H264, renders garbage colors
and/or black and GPU hangs.  The GPU hangs are definitely a vaapi batch, not
from Mesa.

I don't think this is a Mesa bug.  It seems like there are a lot of bugs in
vaapi.  And the setting my patch changed is definitely supposed to be
per-context, so Mesa changing it shouldn't affect vaapi at all.  vaapi probably
doesn't use contexts explicitly, but I thought the kernel was supposed to give
every process a context by default, to prevent state leaks like this.

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