Comment 2 for bug 648631

Please purge the xorg-edgers PPA so you can get a cleaner debugging environment (default Maverick packages).

Please upgrade your system, since there's a chance that this bug might have already been fixed in a more recent kernel. At the text console, login, and then run "sudo apt-get update && sudo apt-get upgrade".

Once you boot into the current Maverick kernel (2.6.35-22.33 at the time of writing this), please attach debugging information to this report by typing "apport-collect -p linux 648631" into a terminal.

If your problem is still present in the current Maverick kernel:

The -15 kernel (which is the kernel that introduced this bug) rebased to the mainline 2.6.35.1 kernel. This indicates that there might be a problem introduced between the 2.6.35 and 2.6.35.1 mainline kernels. Please install both of these mainline kernels from the Mainline Kernel PPA [1], along with the most current mainline kernel (v2.6.36-rc5-maverick/ at the time of writing this) (installation instructions can be found here [2]). Then please test whether the bug is still present in all three of these mainline kernels (including dmesg from all three kernels would also be helpful when you report if they work or not).

Thank you for taking the time to debug and hopefully make Ubuntu better.

[1]: http://kernel.ubuntu.com/~kernel-ppa/mainline/
[2]: https://wiki.ubuntu.com/Kernel/MainlineBuilds