WORKAROUND FOR GOOGLE HANGOUTS AUTO-ADJUST MICROPHONE BREAKS FIXES IN
THIS BUG-REPORT:


# Disable auto adjusting of gain on mic:
# Edit as root: 
/usr/share/pulseaudio/alsa-mixer/paths/analog-input-internal-mic.conf
# Edit as root: /usr/share/pulseaudio/alsa-mixer/paths/analog-input-mic.conf
# Under "[Element Internal Mic Boost]" set "volume"  to "zero".
# Under "[Element Int Mic Boost]" set "volume"  to "zero".
# Under "[Element Mic Boost]" set "volume"  to "zero".

http://askubuntu.com/a/736655

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https://bugs.launchpad.net/bugs/1002978

Title:
  [meta-bug] Inverted Internal microphone (phase inversion)

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  This is a metabug for all machines that are having phase inverted
  internal microphones.

  If your internal mic is either completely silent (no signal), or you
  can possibly pick a very small sound, with much background noise, even
  though you have set gain to maximum, there is something you could try.

  Install the pavucontrol application, start it and go to the "Input Devices" 
tab. Unlock the channels (there is a 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.

  (If you're not running PulseAudio, you can try doing the same through
  AlsaMixer instead (see https://wiki.ubuntu.com/Audio/Alsamixer ), try
  changing "Capture" level or "Internal Mic" or "Internal Mic Boost"
  using the Q,E,Z,C keys.)

  If so, please file a separate bug against the alsa-driver for your
  issue, make sure hardware info gets attached to it (either alsa-info
  as per https://wiki.ubuntu.com/Audio/AlsaInfo or the standard ones
  that follows when you do "ubuntu-bug alsa-driver" ), then write a
  comment in this bug, with your machine name and a pointer to the other
  bug.

  As time permits, I'll try to work on fixing them for the next Ubuntu release. 
Thanks!
   -- David Henningsson

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