On Mon June 6 2011, Tim Smith wrote:
I found I had to
(a) install and use pavucontrol so I could make pulseaudio send stuff to the right places ("everyone" has two soundcards these days as there's the HDMI audio in your graphics card which probably isn't connected to anything unless it is - basically you can't get this right any more and there needs to be an extra configuration step).
(b) play with (in my case) "alsamixer -c 0" to fix up my mixers and stuff. Pulse doesn't seem to like independent headphones - if I turn that on no amount of messing about will get me any sound.
(c) Manually save the ALSA state with alsactl and put something in rc.local to reload it because F15 no longer gets this right, and otherwise I have to do (b) again every time I reboot.
I found that upgrading to Fedora 15 had caused *all* inputs to be muted as well as the outputs. I had to go and un-mute everything. Bloody idiots, IMNSHO, who decided to mute everything on an upgrade!