[Bug 54226] [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54226

--- Comment #135 from Phil Turmel <philip at turmel.org> ---
For what its worth, running 3.13.7 greatly mitigates this bug, to where the
dead time is barely noticeable.  It happened three times in short order here
and I didn't notice any of them:

[ 4562.551141] [drm:ring_stuck] *ERROR* Kicking stuck semaphore on render ring
[ 4582.530028] [drm:ring_stuck] *ERROR* Kicking stuck semaphore on render ring
[ 4633.476199] [drm:ring_stuck] *ERROR* Kicking stuck semaphore on render ring

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