After installing Karmic Koala (Ubuntu 9.10), I was thrilled about the sound working so much better. The latest version of Skype supported pulse directly, and everything seemed to be great.
But then, the sound quit working suddenly, and nothing would bring it back. I checked the Alsa volume settings, I tinkered with several of the config files, and I compared to the configuration with the live CD.
Finally, what solved my problem was:
- deleted (backed up) ~/.pulse
- turned up my volume with the applet by the clock
- ran speaker-test
- I heard noise!
I will continue to keep my eye out for what is breaking the sound, but at least I have a solution. Please let me know if anyone else has this problem.
Here are some of the links that I checked: