I get this BUG with a GT 215 NVidia too. 
Kubuntu 12.10

Jan 21 18:50:03 ahedell kernel: [11133.660764] [drm] nouveau 0000:01:00.0: vm 
flush timeout: engine 0
Jan 21 18:50:05 ahedell kernel: [11135.660040] [drm] nouveau 0000:01:00.0: vm 
flush timeout: engine 5
Jan 21 18:50:09 ahedell kernel: [11137.659521] [drm] nouveau 0000:01:00.0: 
PGRAPH TLB flush idle timeout fail: 0x00b00003 0x00000000 0x00005068 0x00000000
Jan 21 18:50:09 ahedell kernel: [11139.658661] [drm] nouveau 0000:01:00.0: vm 
flush timeout: engine 0
Jan 21 18:50:11 ahedell kernel: [11141.658337] [drm] nouveau 0000:01:00.0: vm 
flush timeout: engine 5
Jan 21 18:50:15 ahedell kernel: [11143.658937] [drm] nouveau 0000:01:00.0: 
PGRAPH TLB flush idle timeout fail: 0x00b00003 0x00000000 0x00005068 0x00000000

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https://bugs.launchpad.net/bugs/977588

Title:
  GPU hangs with PGRAPH TLB flush idle timeout fail

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https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/977588/+subscriptions

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