Comment 3 for bug 1895665

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Daniel van Vugt (vanvugt) wrote : Re: PulseAudio automatically switches from HDMI 2 after display sleep

Please try editing /etc/pulse/default.pa and comment out all of this:

  ### Should be after module-*-restore but before module-*-detect
  load-module module-switch-on-port-available

  ### Use hot-plugged devices like Bluetooth or USB automatically (LP: #1702794)
  .ifexists module-switch-on-connect.so
  load-module module-switch-on-connect
  .endif

Then reboot.