I had the same problem and this page helped me fix it.
Ubuntu Karmic on Dell Studio XPS
After an update on ~ oct 11 2009 the mic did not record anymore.
This is what I needed to do to fix it:
run alsamixer in the command line and use these values:
headphone :: on
headphone1 :: muted
Mic Jack :: Mic in
Digital Input Source :: Digitial Mic 1
Digital Input Source 1 :: Digitial Mic 1
I had the same problem and this page helped me fix it.
Ubuntu Karmic on Dell Studio XPS
After an update on ~ oct 11 2009 the mic did not record anymore.
This is what I needed to do to fix it:
run alsamixer in the command line and use these values:
headphone :: on
headphone1 :: muted
Mic Jack :: Mic in
Digital Input Source :: Digitial Mic 1
Digital Input Source 1 :: Digitial Mic 1
In Pulse I use: Stereo Duplex
Cheers and thanks.