Comment 38 for bug 301755

Has anyone besides Ara actually tested the appropriate updated kernel at http://kernel.ubuntu.com/~dtchen/ ?

There are at least two issues at play for these symptoms. You need to be testing the above kernel, and you need to be running stock jaunty PulseAudio. Most importantly, we need to know which codec you have. You can provide this information via "apport-collect -p alsa-base 301755", or you can download and run http://www.alsa-project.org/alsa-info.sh as a bash script.