[Bug 75268] [ilk] hangs in h264 playback

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75268

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
Write to RCS tail never wakes the GPU up after a ring switch from VCS.
Reasonable assumption that it is something in the last VCS/RCS batch that sends
the GPU into a funk.

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