[Bug 75502] [SNB, IVB] Page flips hang indefinitely, apparently waiting for mmio writes that never happen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75502

--- Comment #28 from Simon Farnsworth <simon at farnz.org.uk> ---
Our QA team has noted that on units where VA-API has never been used, we don't
ever get an issue with stuck pageflips.

I have a unit under test which has played a movie using VA-API once, but is now
doing a mix of OpenGL and X11 rendering. I'm going to see if it freezes, too,
or if it's only possible to freeze it with VA-API actively in use.

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