Comment 12 for bug 771150

Hi,

To anyone experiencing this issue, you're supposed to actively go into the sound settings and telling the system you plugged a microphone in - on the input tab, there should now be a "Microphone" or "Headset Microphone" option that must be selected to activate the mic. Also make sure "Headphones" are not selected.

If you do that, and it still does not work, can you attach alsa-info and "pacmd list" output?