Comment 3 for bug 459982

Luke Yelavich wrote on 2009-10-25:
"Please make sure you have an output + input profile set in the volume control preferences, under the hardware tab. Please also make sure you have the correct input selected under the input tab in the same volume control preferences."

I'm not sure what you mean by that, but in alsamixer no in- or output setting will enable the internal microphone. Changing the microphone selector in alsamixer to internal also doesn't disable the external microphone. I have a feeling the internal microphone gets (should get) activated by a switch in the microphone jack and this switch is not detected/sensed. Regrettably I know no way to verify this 'feeling'.