Created attachment 96112 [details]
GPU crash dump
My system hangs for a few seconds at seemingly random times and I get the following error in the log:
[drm:ring_stuck] *ERROR* Kicking stuck semaphore on render ring
Sometimes accompanied by:
[drm] stuck on render ring
[drm] stuck on blitter ring
I'm using KDE 4.12.2.
Intel Sandy Bridge with nVidia Optimus and Core i7
I'm using the Intel pre-3.0 DDX drivers (currently at 2.99.911).
*** This bug has been marked as a duplicate of bug 54226 ***