Created attachment 119609 [details]
Contents of /sys/class/drm/card0/error

I occasionally get the following message:

Nov 12 20:40:34 xxx kernel: [drm] GPU HANG: ecode 6:-1:0x00000000, reason: Kicking stuck semaphore on render ring, action: continue
Nov 12 20:40:34 xxx kernel: [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
Nov 12 20:40:34 xxx kernel: [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
Nov 12 20:40:34 xxx kernel: [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
Nov 12 20:40:34 xxx kernel: [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
Nov 12 20:40:34 xxx kernel: [drm] GPU crash dump saved to /sys/class/drm/card0/error

CPU: Intel(R) Core(TM) i3-2105 CPU @ 3.10GHz
Motherboard: Asus P8H67-M EVO, BIOS 3703 05/03/2013
Kernel: 4.2.5
OS: Debian testing/unstable mix

I was getting similar messages with 4.1.x kernels too.

Gabor