Comment 102 for bug 477256

First time it's happened to me, after three years with this hardware. Oneiric up-to-date.

linux-image 3.0-2-generic
xserver-xorg-video-intel 2:2.15.0-3ubuntu1
xserver-xorg-input-evdev 1:2.6.0-1ubuntu12

Jun 28 16:02:07 localhost kernel: [11050.384059] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Jun 28 16:02:07 localhost kernel: [11050.384074] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
Jun 28 16:02:07 localhost kernel: [11050.391508] [drm:i915_wait_request] *ERROR* i915_wait_request returns -11 (awaiting 476986 at 476976, next 477014)

X.Org X Server 1.10.2
Release Date: 2011-05-28
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-27-server i686 Ubuntu
Current Operating System: Linux hypatia 3.0-2-generic #3-Ubuntu SMP Fri Jun 24 19:09:43 UTC 2011 i686
Kernel command line: root=UUID=24becfaf-5998-47e3-b62d-18c5e13146b2 ro quiet splash
Build Date: 16 June 2011 02:43:32AM
xorg-server 2:1.10.2-1ubuntu1 (For technical support please see http://www.ubuntu.com/support)
Current version of pixman: 0.21.8
 Before reporting problems, check http://wiki.x.org
 to make sure that you have the latest version.

[ 11050.394] (EE) intel(0): Detected a hung GPU, disabling acceleration.
[ 11050.394] (EE) intel(0): When reporting this, please include i915_error_state from debugfs and the full dmesg.
[ 11083.687] [mi] EQ overflowing. The server is probably stuck in an infinite loop.
[ 11083.687]
Backtrace:
[ 11083.696] 0: /usr/bin/X (xorg_backtrace+0x37) [0x80ec197]
[ 11083.696] 1: /usr/bin/X (mieqEnqueue+0x1d1) [0x80eb3d1]
[ 11083.696] 2: /usr/bin/X (xf86PostMotionEventM+0xb0) [0x80c6c70]
[ 11083.696] 3: /usr/lib/xorg/modules/input/evdev_drv.so (0x21a000+0x368f) [0x21d68f]
[ 11083.696] 4: /usr/lib/xorg/modules/input/evdev_drv.so (0x21a000+0x54e9) [0x21f4e9]
[ 11083.696] 5: /usr/lib/xorg/modules/input/evdev_drv.so (0x21a000+0x5d4d) [0x21fd4d]
[ 11083.696] 6: /usr/bin/X (0x8048000+0x6ba11) [0x80b3a11]

if it happens again, I'll connect from another machine and get i915_error_state state.