In my specific case I have two output devices:

1. an audio card integrated in the motherboard
2. and an external microphone that has a monitoring output jack

Each of them results in two selectable options (there's always a second
"Digital Output (S/PDIF)" prefixed one) in the Ubuntu settings for a
total of 4.

After startup the usb microphone is selected as the output device so I
have to switch it to the integrated sound card analog output.

(you can see details about each device in the `pactl list sinks` output
in my "workaround" comment)

Also whenever I connect my guitar amp (also acts as sound output) it is
automatically selected as the active device and disconnecting it results
in the microphone being selected again no matter what I had selected
before connecting the amp.

There is no HDMI involved anywhere.

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https://bugs.launchpad.net/bugs/1924852

Title:
  Selected output device in Sound settings is not persisted across
  restarts

Status in gnome-control-center package in Ubuntu:
  Invalid
Status in pulseaudio package in Ubuntu:
  Incomplete

Bug description:
  # Introduction

  My computer has multiple audio devices, so I had to select the correct
  one in the "Sound" section of "Settings". This worked fine, except
  that whenever I restart the computer this setting resets to the
  original one. Effectively I have to visit the sound settings on each
  system startup in order to hear anything.

  # How to reproduce

  1. have system with multiple audio outputs
  2. open sound settings
  3. select non-default output device
  4. restart computer
  5. open sound settings

  # Expected result

  Selected audio device is the same as the one selected right before
  restart.

  # Actual result

  The active output device is the original default one (i.e. not the one
  that we selected).

  # System information

  $ lsb_release -rd
  Description:  Ubuntu 20.04.2 LTS
  Release:      20.04

  $ apt-cache policy gnome-control-center
  gnome-control-center:
    Installed: 1:3.36.5-0ubuntu1
    Candidate: 1:3.36.5-0ubuntu1
    Version table:
   *** 1:3.36.5-0ubuntu1 500
          500 http://de.archive.ubuntu.com/ubuntu focal-updates/main amd64 
Packages
          100 /var/lib/dpkg/status
       1:3.36.1-1ubuntu5 500
          500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages

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