I have an Ubuntu 8.10 and have been experiencing the same problem for some time. I also noticed that some time after starting the computer rhythmbox couldn't play any song.
Sorry if my description is not very accurate, but I don't know much linux.
After running 'lsof | grep /dev/snd' i saw that skype was blocking the device. Stopping skype solved the problem.
I have an Ubuntu 8.10 and have been experiencing the same problem for some time. I also noticed that some time after starting the computer rhythmbox couldn't play any song.
This post gave the solution:
https:/ /bugs.launchpad .net/ubuntu/ +source/ pulseaudio/ +bug/2073
Sorry if my description is not very accurate, but I don't know much linux.
After running 'lsof | grep /dev/snd' i saw that skype was blocking the device. Stopping skype solved the problem.