*** This bug is a duplicate of bug 1838151 ***
    https://bugs.launchpad.net/bugs/1838151

This is unfortunately not a bug, it's the Bluetooth standard... A2DP
(high quality output) does not support any input. So if you enable input
you will get forced back to HSP/HFP (which does sound terrible).

But there's a solution coming in the form of a different standard, which
we are tracking in bug 1838151.

** This bug has been marked a duplicate of bug 1838151
   Poor quality audio with modern Bluetooth headsets in HSP/HFP.  Missing wide 
band speech support.

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https://bugs.launchpad.net/bugs/1887796

Title:
  Bluetooth headset cant set output as A2DP sink while using the mic as
  input device

Status in bluez package in Ubuntu:
  Incomplete

Bug description:
  I have the popular Sony WH-100XM3 headset.

  I can connect to the headset fine using bluetooth. I set the Output
  device in Sound Option, there are two configurations A2DP Sink (sounds
  great) and HSP/HFP (sounds terrible).

  If I set the input device to the headset, it silently switches the
  output configuration to HSP/HFP and so the audio sounds terrible.

  If I then switch the output configuation back to A2DP sink, the audio
  output sounds good again, but then the input device switches to
  something else.

  So the problem is that I cant use the headset as audio input while
  having the good-sounding output configuration.

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