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[Christoph Pospiech <724514@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

The hardware is a T400 (6474-B84). The graphics controller is Intel Integrated Graphics 4500MHD (according to www.lenovo.com). From the /proc file system, I get the following.
cp@sirius:/proc/dri/0$ cat name
i915 0000:00:02.0 pci:0000:00:02.0

Software
cp@sirius:~$ uname -a
Linux sirius 2.6.35-25-generic #44-Ubuntu SMP Fri Jan 21 17:40:48 UTC 2011 i686 GNU/Linux
cp@sirius:~$ cat /proc/version_signature
Ubuntu 2.6.35-25.44-generic 2.6.35.10
cp@sirius:~$ lsb_release -rd
Description:	Ubuntu 10.10
Release:	10.10
cp@sirius:~$ dpkg -l xserver-xorg-video-intel*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version        Description
+++-==============-==============-============================================
ii  xserver-xorg-v 2:2.12.0-1ubun X.Org X server -- Intel i8xx, i9xx display d
un  xserver-xorg-v <none>         (no description available)

Error description
- All windows frozen all of a sudden.
- After changing to an ASCII console (Ctrl+Alt+F3): Screen shows an X11 error message every 0.5 second, that contains the terms "drm" and "GPU hang". I haven't found this message in any log files so far. 
- After reboot, /var/log/Xorg.0.log.old shows entries like this one.
[ 2086.079] (EE) intel(0): Failed to submit batch buffer, expect rendering corruption or even a frozen display: Input/output error.

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/724514

Title:
  GPU hang