It happens to me too (Dell Optiplex 760 desktop). The problem only occurs when I enable desktop effects.
Here's the video-related output of lspci -v: 00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller]) Subsystem: Dell Device 027f Flags: bus master, fast devsel, latency 0, IRQ 51 Memory at fe800000 (64-bit, non-prefetchable) [size=4M] Memory at d0000000 (64-bit, prefetchable) [size=256M] I/O ports at ec90 [size=8] Expansion ROM at <unassigned> [disabled] Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [d0] Power Management version 2 Kernel driver in use: i915 Kernel modules: i915 00:02.1 Display controller: Intel Corporation 4 Series Chipset Integrated Graphics Controller (rev 03) Subsystem: Dell Device 027f Flags: bus master, fast devsel, latency 0 Memory at fe700000 (64-bit, non-prefetchable) [size=1M] Capabilities: [d0] Power Management version 2 $ uname -a Linux sybren.chess.nl 2.6.35-28-generic #50-Ubuntu SMP Fri Mar 18 18:42:20 UTC 2011 x86_64 GNU/Linux $ apt-cache policy xserver-xorg-video-intel xserver-xorg-video-intel: Installed: 2:2.12.0-1ubuntu5.2 Candidate: 2:2.12.0-1ubuntu5.2 Version table: *** 2:2.12.0-1ubuntu5.2 0 500 http://nl.archive.ubuntu.com/ubuntu/ maverick-updates/main amd64 Packages 100 /var/lib/dpkg/status 2:2.12.0-1ubuntu5 0 500 http://nl.archive.ubuntu.com/ubuntu/ maverick/main amd64 Packages -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/601530 Title: [965gm] drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting 150858 at 150857) -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs