The following messages in the kern.log seem to cause this issue:

Aug 22 00:25:01 ltop1 kernel: [   32.421438] [drm] nouveau 0000:02:00.0: fail 
set_domain
Aug 22 00:25:01 ltop1 kernel: [   32.421444] [drm] nouveau 0000:02:00.0: 
validate vram_list
Aug 22 00:25:01 ltop1 kernel: [   32.421447] [drm] nouveau 0000:02:00.0: 
validate: -22

present from kernel 3.5.0-10 and on and generated by 
../drivers/gpu/drm/nouveau/nouveau_gem.c.

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https://bugs.launchpad.net/bugs/1039125

Title:
  [drm] nouveau 0000:02:00.0: PFIFO_CACHE_ERROR - Ch 2/2 Mthd 0x0800
  Data 0x00000000

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