[Bug 1908167] Re: [SRU] pulseaudio: the headset-mic or heapdhone-mic could not be selected automatically if there is no internal mic

[Sebastien Bacher]

** Changed in: pulseaudio (Ubuntu Hirsute)
       Status: In Progress => Fix Committed

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Title:
  [SRU] pulseaudio: the headset-mic or heapdhone-mic could not be
  selected automatically if there is no internal mic

Status in HWE Next:
  New
Status in pulseaudio package in Ubuntu:
  Fix Committed
Status in pulseaudio source package in Focal:
  Fix Committed
Status in pulseaudio source package in Groovy:
  Fix Committed
Status in pulseaudio source package in Hirsute:
  Fix Committed

Bug description:
  [Impact]
  On the Dell AIO machines, there is no internal mic, after plugging a
  headset, users expect the headset-mic or headphone-mic could be selected
  automatically. But with the current rule, the headset-mic/headphone-mic will not be selected automatically and even users manually select them, they will not show up in the gnome sound setting, and users could not record sound by headset-mic/headphone-mic.

  [Fix]
  backport a patch from pulseaudio mergerequest, the patch is going to be
  merged to pulseaudio 14.1. This patch could be backported to hirsute without any change, but need to be changed if backport it to groovy and focal.

  [Test]
  On those Dell AIO, plug a headset, open the gnome sound setting, the headset-mic is selected automatically, use the headset-mic to record the sound, the sound could be recorded and the sound quality is good.

  [Where problems could occur]
  This patch could change the policy of audio device switching, it will not
  affect all audio devices, but only the devices which has AVAIL_UNKNOWN available status, that means it has possibility to introduce the regression on headphone-mic ,headset-mic, internal mic and internal speaker's switching since they all has AVAIL_UNKNOWN status. For example, after unpluging the headset, the input device will not switch to internal mic automatically or after unplug the headphone, the output device will not switch to internal speaker automatically. But this possibility is very low, we have tested the patch on many Dell and Lenovo machines, all worked well.

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