Comment 8 for bug 844347

Based on what I've seen, I think it's a pulseaudio problem. I can sometimes boot and mumble will work perfectly. After a short amount of time, it refuses to recognize that I have a microphone and any other app trying to use the microphone (such as Skype or jitsi) is distorted - as if the input gain on the mic was too high - but it isn't. I also get random crashes all the time with Banshee. All of this brokenness all of a sudden with things sound related makes me think it's a pulseaudio issue. There are no errors to spot in the logs though.

This same hardware worked flawlessly under natty. FWIW, I use a USB Logitech Webcam Pro 9000.