Comment 17 for bug 57455

I'm Googling it, and it looks like some are saying that the newer alsa modules have it fixed. You can try compiling the newest alsa driver into your kernel or see if it works with an up-to-date Feisty (I haven't tried changing my /etc/modules back to blank since those options had it working, so I haven't tried to see if newer Feisty works by itself, I just know that it didn't in February).