On my late 2009 Macmini3,1, running Lucid Lynx amd64, changing the model
to mb5 solved the no-sound problem. I have not tested sound input or
digital channels yet, and sound quality when using headphones is not
good. The internal speakers do not seem to mute when headphones are
plugged in. When the S/PDIF channel is unmuted it seems to be constantly
on (I get a red light from the optical audio output jack).

A file created by alsa-info.sh is at http://www.alsa-
project.org/db/?f=c7942ef843ebc8f28b5bbdba34c9a8d7803ebeba

So temporary solution for some Macmini3,1's is:
options snd-hda-intel model=mb5

I'll try to test some more later, to see what is working and what not
whether if I should file a separate bug report.

-- 
no sound on nvidia-based Mac Mini (Macmini3,1)
https://bugs.launchpad.net/bugs/343989
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