I've been using this laptop with Ubuntu/(& variants of Ubuntu) for three or four years. I've never been able to get the microphone to work - internal or the jack - though I've followed a variety of leads. The strange thing is that if I plug in a mic, while Audacity (or similar app) is recording, something like a click can be heard but nothing else. The mic seems to be recognized, but I've never been able to record. I'd really like to use this laptop with Skype (and with the microphone in general).
Currently Using: Xubuntu 11.10/Ubuntu 12.04 Dual Partition
More Details: Using Xubuntu 11.10. If I use Pulse Audio Volume Control and crank the Left & Right Microphone volume bars as far as they will go, Audacity will record what Clementine is playing, but it is barely, barely, barely audible. I've also cranked the volume in ALSAMIXER, but this doesn't help.
The solution offered for the HP Pavilion DV1000 and Skype, offered here, no longer appears to work.