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
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