We posted instructions for upgrading ALSA on Ubuntu to version 1.0.20 but there are a lot of steps to follow so for this reason I searched for an alternative and found a script on the ubuntuforums.org (thanks to soundcheck) which upgrades ALSA to the latest version.
The main idea of upgrading ALSA is to bride the huge delay (up to a year) of updates supplied through the official channels. You must agree that the huge delay is not at all acceptable.
By running the upgrade there'll be a great chance that you get your soundcard up and running or problems resolved. The script will get you the latest official stable ALSA release. You can even install the latest driver snapshot, which is again up to 6 month ahead of the latest stable ALSA release.