Try following the guide on this link and let me know if it does any improvement (NOTE: Read the last post in the thread, by ubuntu_demon, first... important!)
http://www.ubuntuforums.org/showthread.php?t=32063&highlight=alsa+wrapper -- Dapper to Edgy upgrade breaks ALSA when asoundconf was previously used https://launchpad.net/bugs/56996 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
