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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

With the PulseAudio version 1:1.1-0ubuntu15.4
The fix in comment #17 works on  201306-13688
There will be two devices in the "Input" section,
Headset Microphone / Internal Microphone

With the fix in comment #19, it works on 201308-14155
There will be three devices, Internal Microphone / Headset Microphone / Microphone
in the "input" section when the headset is plugged in
And two devices, Headphone / Speaker in the output section.

The headset microphone (with 2-in-1 jack) could work with "Headset
Microphone" selected,

The "Microphone" does not work with a single microphone or a headset microphone even with the "Speaker" selected in the Output section.
It could work if you plug the earphone, and talk into the earphone instead
 (work with the earphone of a 2-in-1 jack headphone or a normal earphone)

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https://bugs.launchpad.net/bugs/1169143

Title:
  Headset support on some Dell machines

Status in HWE Next Project:
  In Progress
Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux-lts-raring” package in Ubuntu:
  New
Status in “pulseaudio” package in Ubuntu:
  Fix Released
Status in “pulseaudio” source package in Precise:
  Fix Released

Bug description:
  [SRU Justification]
  Several new hardware has either headset jacks or headphone-or-mic jacks, where the system cannot detect what has been plugged in. E g, for such a headset jack you can either plug in a headphone or a headset, but since the system cannot tell which one it is, you have to manually tell the system whether you want to use the internal or external mic.
  In the case of a headphone-or-mic jack, you can have the jack functioning as either a headphone or a mic, but not as a headset.

  Without this patch, PulseAudio would not detect the jack correctly,
  and not making all options available to the user.

  [Regression Potential] is very low: this only affects machines with
  the specific name "Headphone Mic Jack" or "Headset Mic Jack", which
  started to appear for a few machines in the 3.5 kernel. People who are
  running 12.04.0 or 12.04.1 will be unaffected. More machines are
  coming in the 3.10 kernel, so this is also a preparation for making
  certification easier later on.

  [Test case] On an affected machine, plug in something into the jack.
  Then go to "Sound Settings" and note what options there are: e g, for
  a headset jack, you should be able to select both external and
  internal mic manually.

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