I tried the liveCD of Helena KDE in a Sony Vaio CW laptop.
I was interested to make working the microphone incorporated in the webcam with skype.
I installed skype in a liveCD session, set all the kmix channel to the greatest value and tried all the Input devices alternatives in the Skype's Options.
Even if the webcam works well, the microphone doesn't.
I had the same problem with kubuntu karmic and opensuse 11.2 (now installed on that pc).
Is this a kernel problem? An alsa problem? Or what?
The laptop can boot with windows 7 too, and there the microphone works fine!