[Bug 1882161] Re: module-switch-on-port-avaiable: switch the port on ucm devices based on the priority

[Sebastien Bacher]

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

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Title:
  module-switch-on-port-avaiable: switch the port on ucm devices based
  on the priority

Status in HWE Next:
  New
Status in OEM Priority Project:
  New
Status in pulseaudio package in Ubuntu:
  Fix Released
Status in pulseaudio source package in Focal:
  Fix Committed
Status in pulseaudio source package in Groovy:
  Fix Released

Bug description:
  This bug originates from an OEM private bug #1875597, then ubuntu
  users reported 2 public bugs #1871329 and #1881659. The 2nd issue of
  #1871329 and the 1st issue of #1881659 have the same root cause as
  #1875597

  [Impact]
  On the Dell machines with multi function audio jack, after installing the ubuntu 20.04 and if the audio driver is sof instead of legacy hda, the headphone/headset can't output sound automatically after users plug in a headphone/headset. This is different from ubuntu 18.04, on the 18.04, the headphone/headset could output sound automatically after plugging in the audio jack.

  [Fix]
  The root cause is the ucm2 conf defines 2 input devices: the Mic2 and Headset MIC, and the pulseaudio parse the input device Headset MIC first then Mic2, finally the audio jack is set to Mic2 mode, this make the audio jack can't output sound anymore. To fix it, let the audio jack set to Headset MIC mode by default (Headset MIC has higher priority than Mic2 in the ucm2 conf), to do so, let pulseaudio send the device event to module-switch-on-port-available by the order of priority in the umc2.

  [Test Case]
  applying the fix patch to pulseaudio, plug a headset/headphone to the multi function audio jack, play sound from headset/headphone, the sound could be heard from headset/headphone.

  [Regression Risk]
  Low, just do a small change to store the ucm devices by their priority. and upstream just merged this patch.

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