Created attachment 108238 [details]
Contents of /sys/class/drm/card0/error
Kernel occasionally reports GPU HANG. I noticed no user-visible effects correlated to this message. This is GPU integrated on Sandy Bridge Core i7-2600K.
[ 518.149655] [drm] GPU HANG: ecode -1:0x00000000, reason: Kicking stuck semaphore on render ring, action: continue
[ 518.149658] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
[ 518.149658] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[ 518.149659] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
[ 518.149660] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
[ 518.149660] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[ 518.150077] [drm] GPU HANG: ecode -1:0x00000000, reason: Kicking stuck semaphore on blitter ring, action: continue
vendor string: The X.Org Foundation
vendor release number: 11601000
X.Org version: 1.16.1
OS: Debian jessie.
I can provide more info when you need it.
This is on vanilla kernel 3.17.1.
*** This bug has been marked as a duplicate of bug 54226 ***