Comment 111 for bug 541511

If someone wants to help upstream verify the potential fix on your 855GM hardware, Christian Beier has built a kernel-package with the patches (for Debian, but hopefully it will also work in Lucid). See https://bugs.freedesktop.org/show_bug.cgi?id=27187#c98 . The feedback they want is dmesg output from running this for a few hours while exercising the system (glxgears, 3D-apps, video, screensavers, x11perf, and whatever you may think of). If the system hangs, the file /sys/kernel/debug/dri/0/i915_error_state is interesting (will have to be retrieved by ssh while the system is hung). It is a bit slower than usual due to all the debugging code that is intended to catch any errors.

Of course, this will not work with xserver-xorg-video-intel 2:2.9.1-3ubuntu3, since it disables DRI. The one in my standard PPA should be equivalent to the current Lucid one, except that DRI is not disabled. https://launchpad.net/~gomyhr/+archive/standard