Comment 5 for bug 605861

Have you also tried this as Daniel T Chen proposed:

> Make sure you've tried both linux-backports-modules-alsa-lucid-generic from
> the universe repository and linux-alsa-driver-modules-$(uname -r) from
> ppa:ubuntu-audio-dev. Please note that you can only have one of the above
> package dependencies installed.

This is also explained in http://wiki.ubuntu.com/Audio/UpgradingAlsa