On 09/25/2012 06:28 PM, Dave Lentz wrote:
> Check to make sure you don't have an inverted mic:
> Install the pavucontrol application, start it and go to the “Input Devices” 
> tab. Unlock the channels (click the keylock icon), then mute the right 
> channel while keeping the left channel at the volume you want.
> If the internal mic is now working correctly, you have an inverted internal 
> mic, so that your right channel cancels out the left one.
>
I tried to do exactly what you said, however it didn't work, I still 
didn't hear any sound. I even tried it with the right channel.

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https://bugs.launchpad.net/bugs/1056347

Title:
  [, SigmaTel STAC9221 A1, pink Line In, Rear] No sound at all .   Pink
  Microphone port does not work.

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