Comment 27 for bug 526354

@Maxime
There was a regression issue hence 2.6.32-20 doesnt have this fix anymore.

If you want the fix you can install the latest kernels 2.6.34, like i installed http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.34-rc4-lucid/

take the two debs for your architecture, mine is amd64. Then put them in the same folder and run
sudo dpkg -i *.deb