Created attachment 94293 [details]
content of /sys/class/drm/card0/error
that happens randomly in both, SnadyBridge and IvyBridge for
a longer time with several kernel releases
[16688.095803] [drm] stuck on render ring
[16688.095810] [drm] stuck on blitter ring
[16688.095812] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[16688.095823] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
[16688.095824] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[16688.095825] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
[16688.095826] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
*** This bug has been marked as a duplicate of bug 54226 ***