Upstream reference
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/294

@Hui, do you have any other pending changes for G-serie before we do an
upload?

There are also several fixes in the review queue for focal, do you think
we have enough to do another SRU round or do you have more fixes you are
working on? (also bionic is going to need an upload once bug #1881094 is
sorted out)

** Changed in: pulseaudio (Ubuntu Focal)
   Importance: Undecided => High

** Changed in: pulseaudio (Ubuntu Groovy)
   Importance: Undecided => High

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

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https://bugs.launchpad.net/bugs/1882161

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

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

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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