Comment 169 for bug 318942

Got microphone to work:
1. Did these 3 steps: http://ubuntuforums.org/showpost.php?s=ee9732a9b053e16bc9684c4a6f4fcde9&p=1997541&postcount=4

BUT: You have to change /etc/modprobe.d/alsa-base.conf

2. Activated the new tracks under Volume Control - Preferences

3. Set for first one: Line
    Second one: Microphone

4. Tried different inputs in Audio Recorder

Everything works perfect. Probably you have to reboot between step 1 and 2

Hope it will also work for you