Well, I haven't tested it on the real hardware, but I believe that the
hda-jack-retask program (or parts of it) could be used as a backend.
That is a somewhat crude solution as PulseAudio will be restarted during
jack retasking (and thus all applications using the audio system will
have to be restarted, unless they autoconnect).

If we want something more elegant, we could write a kernel patch to set
the jack to different functions given an alsa mixer control. I don't
think that would be too difficult, but for 12.04, time is about to run
out for kernel patches.

Regardless of strategy, we're going to need a custom GUI for it to be
user friendly enough. Designing that GUI and making it show up when you
plug it in (or whatever) might be the biggest work item.

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

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

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