Comment 43 for bug 505474

@Ed:

Thanks for taking the time to look into this. The fix for your issue has recently been committed to the Karmic (and Lucid) kernel sources. It's in the current Lucid kernel, but since there's a more rigid and less frequent process for released distributions it has not yet been released for Karmic. You can find the relevant commit for Karmic at:

http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-karmic.git;a=commitdiff;h=f715e7fcd18f17b94a661a0678a7e562f7557809;hp=80458d7b5e31dffead1631222440beab91483748

The first kernel with this fix is currently in karmic-proposed. After it goes through more testing it will get pushed out to karmic-updates. If you don't want to wait for it you can install the package manually by downloading it from:

https://launchpad.net/ubuntu/+source/linux/2.6.31-21.59

You should only need the linux-image-2.6.31-21-generic, linux-headers-2.6.31-21, and linux-headers-2.6.31-21-generic packages.

If this kernel fixes things for you, great! If you still have an issue, please open a separate bug for it.