Comment 17 for bug 639846

this bug in pulseaudio or alsa

The internal microphone works, if channels of an input are unblocked, and cursors of channels cost one in the full loudness, the second in silence

found from russian forum http://ubuntologia.ru/forum/viewtopic.php?f=96&t=1934
On a picture:
 1. To press
 2. To disconnect

my acer Emachines 350 mic work

sorry my bad english