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[Tefalus <neil.davies44@xxxxxxxxx>]

Hi,

I am having the same issue on my Toshiba Tecra M5 laptop.  The output
from my kern.log when this happens is:

May  7 21:30:51 ccc017400 kernel: [41191.508136] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
May  7 21:30:51 ccc017400 kernel: [41191.508151] render errMay  7 21:30:51 ccc017400 kernel: [41191.508136] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
May  7 21:30:51 ccc017400 kernel: [41191.508151] render error detected, EIR: 0x00000000
May  7 21:30:51 ccc017400 kernel: [41191.508192] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 2207294 at 2207291)
May  7 21:30:52 ccc017400 kernel: [41192.724110] wlan0: deauthenticating from 00:1f:33:7a:8c:b2 by local choice (reason=3)
May  7 21:49:44 ccc017400 kernel: Kernel logging (proc) stopped.
May  7 21:50:41 ccc017400 kernel: imklog 4.2.0, log source = /proc/kmsg started.or detected, EIR: 0x00000000
May  7 21:30:51 ccc017400 kernel: [41191.508192] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 2207294 at 2207291)
May  7 21:30:52 ccc017400 kernel: [41192.724110] wlan0: deauthenticating from 00:1f:33:7a:8c:b2 by local choice (reason=3)
May  7 21:49:44 ccc017400 kernel: Kernel logging (proc) stopped.
May  7 21:50:41 ccc017400 kernel: imklog 4.2.0, log source = /proc/kmsg started.

My output from lspci -vvnn:


00:02.1 Display controller [0380]: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller [8086:27a6] (rev 03)
	Subsystem: Toshiba America Info Systems Device [1179:0004]
	Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Region 0: Memory at 8a200000 (32-bit, non-prefetchable) [disabled] [size=512K]
	Capabilities: <access denied>


The tail end of my Xorg.0.log is:


(II) UXA(0): Driver registered support for the following operations:
(II)         solid
(II)         copy
(II)         composite (RENDER acceleration)
(==) intel(0): Backing store disabled
(==) intel(0): Silken mouse enabled
(II) intel(0): Initializing HW Cursor
(II) intel(0): No memory allocations

Fatal server error:
Failed to submit batchbuffer: Input/output error


Please consult the The X.Org Foundation support 
	 at http://wiki.x.org
 for help. 
Please also check the log file at "/var/log/Xorg.0.log" for additional information.

 ddxSigGiveUp: Closing log


For me this appears to happen when my external monitor goes to standby mode.  I will test this on the laptop display.

-- 
[g41] GPU hung:  Failed to submit batchbuffer: Input/output error
https://bugs.launchpad.net/bugs/555573
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