Comment 1 for bug 427890

Care to test with the latest Karmic 9.10 Alpha release. It contains a much newer 2.6.31 based kernel.

http://cdimage.ubuntu.com/releases/karmic/

If the issue remains, while still running Karmic, please run the following command which will automatically gather and attach kernel debug info to this report:

apport-collect -p linux 427890