aha! I found a page (https://help.ubuntu.com/community/Macmini4-1/Maverick) that pointed me to model=mbp55, which works great.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/343989 Title: no sound on nvidia-based Mac Mini (Macmini3,1) -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs