[Nouveau] [Bug 41585] X freeze and PGRAPH errors in dmesg

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=41585

--- Comment #7 from Marcin Slusarz <marcin.slusarz at gmail.com> 2011-10-10 09:42:46 PDT ---
It's looping on DRM_NOUVEAU_GEM_CPU_PREP ioctl which is periodically
interrupted by SIGALRM signal. On the kernel side it's hanging on a fence in
__nouveau_fence_wait.

It's a typical symptom of GPU lockup.

To fix this, someone needs to figure out why GPU locked up and/or how to reset
the GPU.

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