Solution discovered. This was an upgrade from 10.10. snd-hda-dkms needed to be uninstalled.
http://ubuntuforums.org/showthread.php?t=1701895 ** Changed in: alsa-driver (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/780874 Title: [MacBookAir3,2, Cirrus Logic ID 4206, Speaker, Internal] No sound at all -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
