*** This bug is a duplicate of bug 1871794 ***
    https://bugs.launchpad.net/bugs/1871794

Noticed that I couldn't use my headset mic on any apps in the past month, but 
the above reports are describing the same behavioural issues as I am seeing soI 
think I am hitting the same problem.
 
Using Sennheisser HD 4.40BT headphones on a System76 Gazelle. Connects default 
audio through headphones with the A2DP profile as expected when connecting 
through BT, but the Internal Microphone stays selected for input. Trying to 
select the HD4.4 microphone setting does nothing, and no signal of any kind 
comes through the input.

Switching to the HFP/HSP profile also leads to a break in audio, and
after the A2DP setting is shown as unavailable until I wipe the userland
pulse configs. It cuts off the audio through the headset and ends up in
a bad configuration where I have to turn BT off and on again to
reconnect and when it does, the configuration is stuck on HFP/HSP and in
mono.

No audio through the headset mic can be picked up through any
pulseaudio-enabled monitors, all showing zero input with whatever
configuration or set-up I can muster.

Running Linux pop-os 5.4.0-7642-generic #46~1598628707~20.04~040157c-
Ubuntu SMP Fri Aug 28 18:02:16 UTC  x86_64

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https://bugs.launchpad.net/bugs/1878194

Title:
  [Sennheiser HD 4.50 BTNC] Bluetooth headset not working when selecting
  HSP/HFP audio profile in Focal Fossa

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