I have this problem too.
Ubuntu Lucid 10.04. I have the same hardware of the reporter (I check the PCImultimedia file)
Some package versions: linux 2.6.32.13.13 pulseaudio 0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu5 alsa-base 1.0.22.1+dfsg-0ubuntu3
The almixer tip didn't work for me as alsamixer has not the "Input Source [Mic]" switch
I have this problem too.
Ubuntu Lucid 10.04.
I have the same hardware of the reporter (I check the PCImultimedia file)
Some package versions: 0.9.21+ stable- queue-32- g8478-0ubuntu5 1+dfsg- 0ubuntu3
linux 2.6.32.13.13
pulseaudio 0.9.22~
alsa-base 1.0.22.
The almixer tip didn't work for me as alsamixer has not the "Input Source [Mic]" switch