Comment 6 for bug 1175266

Same for me. Switched to NVIDIA drivers now, don't now if it helps yet.

Aug 17 23:31:04 server kernel: [73915.677965] nouveau E[ PGRAPH][0000:01:00.0] ch 2 [0x003fb34000] subc 2 class 0x502d mthd 0x0860 data 0x000000ff
Aug 17 23:31:04 server kernel: [73915.677979] nouveau E[ PFB][0000:01:00.0] trapped write at 0x00207b4300 on channel 0x0003fb34 PGRAPH/PROP/DST2D reason: PAGE_NOT_PRESENT
Aug 17 23:31:04 server kernel: [73915.678012] nouveau E[ PGRAPH][0000:01:00.0] TRAP_TPDMA_2D - TP 0 - Unknown fault at address 00207b5000
Aug 17 23:31:04 server kernel: [73915.678014] nouveau E[ PGRAPH][0000:01:00.0] TRAP_TPDMA_2D - TP 0 - e0c: 00000000, e18: 00000000, e1c: 00c00004, e20: 00000037, e24: 0c030000
Aug 17 23:31:04 server kernel: [73915.678016] nouveau E[ PGRAPH][0000:01:00.0] TRAP
Aug 17 23:31:04 server kernel: [73915.678018] nouveau E[ PGRAPH][0000:01:00.0] ch 2 [0x003fb34000] subc 2 class 0x502d mthd 0x0860 data 0x00000000
Aug 17 23:31:04 server kernel: [73915.678032] nouveau E[ PFB][0000:01:00.0] trapped write at 0x00207b5100 on channel 0x0003fb34 PGRAPH/PROP/DST2D reason: PAGE_NOT_PRESENT
Aug 17 23:31:04 server kernel: [73915.690404] nouveau E[ PFB][0000:01:00.0] trapped write at 0x00207b5800 on channel 0x0003fc44 PGRAPH/PROP/DST2D reason: PAGE_NOT_PRESENT
Aug 17 23:57:11 server kernel: [75476.425870] nouveau E[ PFIFO][0000:01:00.0] DMA_PUSHER - Ch 2 Get 0x002001eed0 Put 0x0020022ff8 IbGet 0x000001c8 IbPut 0x000001c9 State 0x80004861 (err: INVALID_CMD) Push 0x00702031
Aug 17 23:57:11 server kernel: [75476.438963] nouveau E[ PFIFO][0000:01:00.0] DMA_PUSHER - Ch 2 Get 0x0020022ff8 Put 0x0020022ff8 IbGet 0x000001c8 IbPut 0x000001cb State 0x80000000 (err: INVALID_CMD) Push 0x00400040
Aug 17 23:59:15 server kernel: [75600.159331] nouveau E[ PFIFO][0000:01:00.0] DMA_PUSHER - Ch 2 Get 0x00200228a4 Put 0x0020022f4c IbGet 0x000002bd IbPut 0x000002c0 State 0x80004861 (err: INVALID_CMD) Push 0x00400040