*** This bug is a duplicate of bug 1838151 ***

Sorry, I should have noticed this earlier. A2DP does not support
microphones. If you want to use a microphone then yes it will switch to
low quality HSP mode. This is not a bug, but is a limitation in the
Bluetooth spec. Everything is behaving correctly...

But something better is on the way, so I will mark this as a duplicate
of 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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  Disable A2DP when switch input device

Status in bluez package in Ubuntu:
Status in pulseaudio package in Ubuntu:

Bug description:

  How to reproduce:

  1) Connect the headset via Bluetooth
  2) Automatically will use A2DP (until here everything ok)
  3) Go to sound settings, will be the "internal microphone" selected. Switch 
to use the microphone of the headset and will switch to low-quality audio HSP

  Happens with the upgrade: bluez:amd64 (5.50-0ubuntu4 ->
  5.50-0ubuntu5). Before that upgrade, everything was working fine. Only
  the automatic selection of A2DP fails sometimes but the microphone and
  A2DP were possible to use. After the mentioned upgrade to
  5.50-0ubuntu5, it's just impossible to use the microphone and the A2DP
  audio at the same time.

  When I do the switch in the input device in the syslog it's the
  following message:

  kernel: Bluetooth: hci0: SCO packet for unknown connection handle 0

  I tried to downgrade to 5.50-0ubuntu4 but didn't work, the A2DP is not
  usable at all.

  pulseaudio[8370]: Refused to switch profile to a2dp_sink: Not

  Description:  Ubuntu 19.10
  Release:      19.10
  Device: LE_WH-H900N (h.ear)


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