I am running Ubuntu 12.10 on a Dell Studio XPS 16 and the headphone jack isn't working. The internal speakers work fine. I have tried a lot of suggestions from different posts, but none of them work.
I have a Dell Studio XPS 1647 and headphones do not work (though , internal speakers work like a charm) , I have dual boot Windows 7 and headphones work perfectly fine ...
I also tried -adding in options snd-hda-intel model=eapd probe_mask=1 position_fix=1.
I've experienced this with Oneric Ocelot and the latest Precise Pangolin (LTS).