GPU stuck and restarted :
[drm] stuck on render ring
[drm] stuck on blitter ring
[drm] GPU crash dump saved to /sys/class/drm/card0/error
[drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
[drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
[drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
the bugzilla wont accept the 3000 Kb /sys/class/drm/card0/error ( request timeout ) so i uploaded it here : http://xena.ww7.be/gpu_crash.txt
*** This bug has been marked as a duplicate of bug 54226 ***