Forwarding this bug from Ubuntu reporter mdferrier:
  https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/822098

[Problem]
Easily reproduced gpu hang when playing video game.  Regression seen starting after  upgrading to the 3.0.0 kernel.

[Original Report]
Have GPU lockups every time I play Spring RTS with the Zero-K mod. Usually about 15-20 minutes into the game. This did not occur before upgrading to Oneiric. Have not tried the game with other mods yet or different options. But seems to be a general GPU problem because I also seem to experience major issues when I turn on GPU rendering in the Chrome browser

DistroRelease: Ubuntu 11.10
Package: xserver-xorg-video-intel 2:2.15.0-3ubuntu2
Uname: Linux 3.0.0-7-generic x86_64
NonfreeKernelModules: wl
Architecture: amd64
Chipset: i965gm
CompizPlugins: None
CompositorRunning: compiz
Date: Sat Aug 6 15:35:54 2011
DistUpgraded: Log time: 2011-07-14 09:26:10.633650
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus: bcmwl, 5.100.82.38+bdcom, 3.0.0-7-generic, x86_64: installed
GpuHangFrequency: Several times a week
GpuHangReproducibility: Yes, I can easily reproduce it
GpuHangStarted: Immediately after installing this version of Ubuntu
GraphicsCard:
 Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) [8086:2a02] (rev 0c) (prog-if 00 [VGA controller])
   Subsystem: Dell Latitude D630 [1028:01f9]
   Subsystem: Dell Device [1028:01f9]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110413)
InterpreterPath: /usr/bin/python2.7
MachineType: Dell Inc. Latitude D630
ProcCmdline: /usr/bin/python /usr/share/apport/apport-gpu-error-intel.py
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-7-generic root=UUID=9a265c0e-ba5a-45de-9963-8b63ba28dfe3 ro quiet splash vt.handoff=7
UpgradeStatus: Upgraded to oneiric on 2011-08-05 (1 days ago)
UserGroups:

version.compiz: compiz 1:0.9.5.0-0ubuntu2
version.ia32-libs: ia32-libs 20090808ubuntu13
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11~1-0ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11~1-0ubuntu4
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.2-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.0-3ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1