How would I go about finding my model of motherboard? For me, sound worked fine when I first installed a few months back, then it didn't work, then it worked after installing some updates, and then broke again a few days ago after installing some other updates. I saw some chatter on the mailing list about sound at around the same time I noticed mine break, so I assumed it was something that everyone else was experiencing too, but in any case, I'm running the LXDE spin, FWIW.
Anyway it sure would be cool to have sound back.