Working with a new Latitude E6500 and Ubuntu 8.10. Just about everything works - but I tried to install Skype and discovered that the mic doesn't record sound! Same is true of Ekiga and the Sound Recorder app, so it's not Skype.
It appears to be detected properly -- in Sound Recorder, for example, the capture process works, and the level meter appears and fluctuates slightly -- but it does not respond to even very loud sounds, nor can you hear anything but a hiss when playing back.
The mic works in Vista. Also, plugging a microphone into the jack works -- that sound is captured. It's a problem with the built-in mic.