Same happens regularly - dmesg contains loads of:

[10046.802408] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x0000060d
[10046.802417] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802420] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000176
[10046.802429] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802432] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x000003c9
[10046.802441] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802445] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000176
[10046.802453] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802457] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x000003ca
[10046.802465] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802469] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000186
[10046.802515] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802519] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x0000041c
[10046.802531] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802535] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000176
[10046.802544] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802547] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x0000041d
[10046.802556] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802559] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000186
[10046.802568] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802571] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x0000046f
[10046.802580] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802584] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000176
[10046.802593] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802596] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x00000470
[10046.802605] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802608] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000186
[10046.802617] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802621] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x000004c2
[10046.802630] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802633] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000176
[10046.802642] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802645] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x000004c3
[10046.802654] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802657] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000186
[10046.802667] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802670] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x00000515
[10046.802679] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802682] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000176
[10046.802691] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802694] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x00000516
[10046.802703] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802706] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000186
[10046.802715] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802719] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x00000568
[10046.802728] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802731] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000176
[10046.802740] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802743] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x00000569
[10046.802752] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802755] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000186
[10046.802764] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802767] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x000005bb
[10046.802777] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802780] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000176
[10046.802789] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802792] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x000005bc
[10046.802801] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802804] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000186
[10046.802813] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802817] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x00000000
[10046.802826] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802829] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000186
[10046.802838] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802841] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x0000060d
[10046.802850] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802853] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000187
[10046.802863] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802866] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x000003c9
[10046.802875] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802878] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000187
[10046.802887] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802890] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x000003ca
[10046.802899] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802902] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000197
[10046.802912] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802915] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x0000041c
[10046.802924] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802927] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000187
[10046.802936] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802939] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x0000041d
[10046.802948] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802951] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000197
[10046.802961] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802964] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x0000046f
[10046.802973] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802976] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000187
[10046.802985] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.802988] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x00000470
[10046.802997] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803000] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000197
[10046.803009] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803013] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x000004c2
[10046.803022] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803025] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000187
[10046.803034] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803037] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x000004c3
[10046.803046] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803049] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000197
[10046.803058] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803062] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x00000515
[10046.803071] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803074] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000187
[10046.803083] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803086] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x00000516
[10046.803095] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803098] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000197
[10046.803107] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803110] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x00000568
[10046.803119] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803123] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000187
[10046.803132] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803135] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x00000569
[10046.803144] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803147] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000197
[10046.803156] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803159] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x000005bb
[10046.803168] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803172] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000187
[10046.803181] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803184] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x000005bc
[10046.803193] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803196] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000197
[10046.803205] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803208] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x00000000
[10046.803217] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803220] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000197
[10046.803230] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803233] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x0000060d
[10046.803242] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803245] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x00000198
[10046.803254] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803257] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x000003c9
[10046.803266] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803269] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000198
[10046.803279] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803282] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x000003ca
[10046.803291] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803294] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x000001a8
[10046.803303] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803306] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x0000041c
[10046.803316] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803319] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000198
[10046.803328] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803331] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x0000041d
[10046.803340] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803343] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x000001a8
[10046.803352] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803355] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x0000046f
[10046.803365] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803368] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000198
[10046.803377] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803380] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x00000470
[10046.803389] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803392] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x000001a8
[10046.803401] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803404] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0600 data 0x000004c2
[10046.803413] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803416] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0604 data 0x00000198
[10046.803425] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803428] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x0608 data 0x000004c3
[10046.803437] nouveau E[  PGRAPH][0000:01:00.0]  ILLEGAL_MTHD ILLEGAL_CLASS
[10046.803440] nouveau E[  PGRAPH][0000:01:00.0] ch 3 [0x001fb24000 
Xorg[19658]] subc 2 class 0x0000 mthd 0x060c data 0x000001a8
[10046.806480] nouveau E[     PFB][0000:01:00.0] trapped write at 0x0000000000 
on channel 0x0001fb24 [Xorg[19658]] PGRAPH/DISPATCH/GRCTX reason: DMAOBJ_LIMIT
[10047.131817] nouveau E[     PFB][0000:01:00.0] trapped read at 0x0040990000 
on channel 0x0001fb24 [Xorg[19658]] PGRAPH/TEXTURE/00 reason: PAGE_NOT_PRESENT

Not sure if I can provide any more useful information since it seems to
happen randomly and independently of current keyboard/mouse interaction.
The screen just froze without me sitting in front of the box.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-nouveau in Ubuntu.
https://bugs.launchpad.net/bugs/1314405

Title:
  Screen freezes due to Xorg crashed SIGABRT and noveau error

Status in “xserver-xorg-video-nouveau” package in Ubuntu:
  New

Bug description:
  The machine just freezes in my Unity session, sometimes after minutes, 
sometimes after some hours.
  Any audio is running about ten minutes longer before the machine either 
reboots or Xorg is reloaded. Happens daily since updating to 14.04. I cannot 
change to different terminals to manually reload Xorg, the machine is blocked 
once the screen freezes.

  Trying to report the problem via aport-gtk yields an error upon upload:
  Apr 29 23:03:08 m whoopsie[1380]: message repeated 3 times: [ offline]
  Apr 29 23:03:08 m whoopsie[1380]: online
  Apr 29 23:03:08 m whoopsie[1380]: Parsing /var/crash/_usr_bin_Xorg.0.crash.
  Apr 29 23:03:09 m whoopsie[1380]: Uploading /var/crash/_usr_bin_Xorg.0.crash.
  Apr 29 23:05:09 m whoopsie[1380]: Sent; server replied with: No error
  Apr 29 23:05:09 m whoopsie[1380]: Response code: 502
  Apr 29 23:05:09 m whoopsie[1380]: Server replied with:
  Apr 29 23:05:09 m whoopsie[1380]: <html><body><h1>502 Bad Gateway</h1>#012The 
server returned an invalid or incomplete response.#012</body></html>#012
  Apr 29 23:05:09 m whoopsie[1380]: Could not upload; processing later 
(/var/crash/_usr_bin_Xorg.0.crash).
  Sometimes I do see the aport-UI after logging in to my unity session, but the 
screen disappears and my unity session is loaded 1 second later.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CompizPlugins: 
[core,bailer,detection,composite,opengl,compiztoolbox,decor,snap,place,move,imgpng,mousepoll,grid,gnomecompat,unitymtgrabhandles,resize,vpswitch,regex,wall,session,animation,fade,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Tue Apr 29 23:19:46 2014
  DistUpgraded: 2014-04-24 15:44:51,909 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 4.3.10, 3.13.0-24-generic, x86_64: installed
   virtualbox, 4.3.10, 3.2.0-61-generic, x86_64: installed
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   NVIDIA Corporation GT218 [GeForce 210] [10de:0a65] (rev a2) (prog-if 00 [VGA 
controller])
     Subsystem: CardExpert Technology Device [10b0:1401]
  InstallationDate: Installed on 2010-12-04 (1241 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  MachineType: Gigabyte Technology Co., Ltd. H55M-USB3
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic 
root=UUID=8270ae71-32ed-493b-b740-b52a09b3b4c3 ro nomdmonddf nomdmonisw 
nomdmonddf nomdmonisw
  SourcePackage: xserver-xorg-video-nouveau
  UpgradeStatus: Upgraded to trusty on 2014-04-24 (5 days ago)
  dmi.bios.date: 11/01/2010
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F11
  dmi.board.name: H55M-USB3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF11:bd11/01/2010:svnGigabyteTechnologyCo.,Ltd.:pnH55M-USB3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnH55M-USB3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: H55M-USB3
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  version.compiz: compiz 1:0.9.11+14.04.20140423-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.10-1ubuntu2
  xserver.bootTime: Tue Apr 29 23:03:06 2014
  xserver.configfile: default
  xserver.devices:
   input        Power Button         KEYBOARD, id 6
   input        Power Button         KEYBOARD, id 7
   input        USB Keyboard         KEYBOARD, id 8
   input        USB Keyboard         KEYBOARD, id 9
   input        ImExPS/2 Logitech Wheel Mouse MOUSE, id 10
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.15.1-0ubuntu2
  xserver.video_driver: nouveau

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