Command 'amixer -c0 contents' shows on/off-states correctly for mic and 
headphone but  'pacmd list-cards' says unknown in case of 
analog-output-headphones. 
However the microphone shows correct states for 'analog-input-microphone' and 
therefore the volume application switches automatically between external and 
internal microphone volume.
But I have to open the volume application every time I connect my headset and 
change to correct output device manually to get some sound therefore please 
backport to precise.
Lenovo T500, Ubuntu 12.04

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https://bugs.launchpad.net/bugs/771150

Title:
  [Feature] support the external headphone/microphone jack sensing

Status in OEM Priority Project:
  Fix Committed
Status in OEM Priority Project precise series:
  In Progress
Status in OEM Priority Project quantal series:
  Fix Committed
Status in PulseAudio sound server:
  New
Status in “alsa-driver” package in Ubuntu:
  Fix Committed

Bug description:
  The eeepc has a combined hole shared by the external microphone and
  headphone. Currently the default behaviour in Ubuntu is for headphone.
  (The music comes from headphone and the internal speaker is muted when
  plugging the headphone).

  This bug is intended for discussing and tracking the possibility and
  practicability of the support both headphone/microphone jack sensing
  in Linux driver or it is only achievable to support either one.

To manage notifications about this bug go to:
https://bugs.launchpad.net/oem-priority/+bug/771150/+subscriptions

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