While plug in an audio device and the dialog prompt, there are one
additional option 'Headphones' appearing in Output settings and two
options 'Headset Microphone', 'Microphone' in Input settings. The
selected options will be changed after plugged in device is clicked.

Headphones clicked
Output --> Headphones
Input --> Internal Microphone

Headset clicked
Output --> Headphones
Input --> Headset Microphone

Microphone clicked
Output --> Speakers
Input --> Microphone

The rest options are still selectable but not functional. It would be
less confused to remove extra options. For example, when a microphone is
plugged in and clicked, there are only 'internal speakers' in output
settings and 'internal microphone', 'external microphone' in output
settings. Extra headphone and headset microphone should be removed from
output/input settings. (wishlist)

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https://bugs.launchpad.net/bugs/1239605

Title:
  Combo audio jack support ("what did you plug in?"-dialog)

Status in OEM Priority Project:
  Fix Released
Status in OEM Priority Project precise series:
  Won't Fix
Status in unity-settings-daemon package in Ubuntu:
  Fix Released
Status in unity-settings-daemon source package in Precise:
  Won't Fix

Bug description:
  This is about a specific set of new laptops, which has only one 3.5 mm
  jack for analog audio, and where that jack can be used to plug in a
  headphone, headset, and in some cases, a microphone.

  Previously, these jacks have been able to distinguish - in hardware -
  between a headphone and a headset (i e headphone with mic), but it seems
  to be increasingly common that they don't have this ability.

  Our current solution, as it works in 13.10, is that for these machines
  one has to manually select the right input and output in sound settings.

  Here's an example on how the dialog looks in Windows:
  https://launchpadlibrarian.net/70431415/2011-03-08%2017.08.26.jpg -
  probably provided by Realtek 3rd party drivers.

  We can either choose to implement a similar dialog, or just to provide
  notify-OSD on plug of audio jack for user to choose between
  microphone, headphone/speakers, or headset if it is a four ring jack.
  Choosing the notify-OSD instead of an OSD is a compromise between
  "making it easy for users to reconfigure jack" and "avoiding annoying
  distractions".

  Timeline wise it would be nice to merge this in the early 14.04 cycle.
  We also need to ship it in OSP2 (OEM Service Pack 2, shipped on 
pre-installs). Hence it would be good if we could have input/ack from design 
team ASAP, or at least by the end of October.

  <https://wiki.ubuntu.com/Sound#unknown-device>: "When a device is
  plugged into an audio jack that can’t distinguish between
  headphones/speakers, headsets, or microphones, Ubuntu should display
  an “Unknown Audio Device” dialog..."

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