I have the same problem with Sony WF-1000XM3 and Ubuntu 16.04. I
realized that when the headphones connect automatically, they don't
appear when running ``pacmd list-sinks``. If I disconnect and reconnect
them manually, they do and a2dp is used.

I wrote a couple of scripts to automatize this and temporarily
circumvent the issue.

** Attachment added: "checkBTConnection.zip"
   
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1845046/+attachment/5311468/+files/checkBTConnection.zip

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Touch seeded packages, which is subscribed to bluez in Ubuntu.
https://bugs.launchpad.net/bugs/1845046

Title:
  Bluetooth headphones/speaker default to low quality headset mode and
  fails to switch to A2DP when selected

Status in bluez package in Ubuntu:
  Confirmed
Status in gnome-control-center package in Ubuntu:
  Confirmed
Status in pulseaudio package in Ubuntu:
  Confirmed

Bug description:
  Whenever I turn on my headphones theyll connect to my computer but im
  able to hear the input audio from my microphone and low quality output
  audio. I have to disconnect the headphones in the bluetooth devices
  and reconnect for it to fix the problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: pulseaudio 1:11.1-1ubuntu7.2
  ProcVersionSignature: Ubuntu 5.0.0-29.31~18.04.1-generic 5.0.21
  Uname: Linux 5.0.0-29-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  litleck    1398 F.... pulseaudio
   /dev/snd/controlC0:  litleck    1398 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Sep 23 17:07:59 2019
  InstallationDate: Installed on 2019-09-22 (0 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 
(20190805)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: pulseaudio
  Symptom: audio
  Symptom_Card: WH-1000XM3
  Symptom_Type: High background noise, or volume is too low
  Title: [WH-1000XM3, playback] Background noise or low volume
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/12/2019
  dmi.bios.vendor: Alienware
  dmi.bios.version: 1.0.19
  dmi.board.name: 01NYPT
  dmi.board.vendor: Alienware
  dmi.board.version: A00
  dmi.chassis.type: 3
  dmi.chassis.vendor: Alienware
  dmi.chassis.version: Not Specified
  dmi.modalias: 
dmi:bvnAlienware:bvr1.0.19:bd02/12/2019:svnAlienware:pnAlienwareAuroraR5:pvr1.0.19:rvnAlienware:rn01NYPT:rvrA00:cvnAlienware:ct3:cvrNotSpecified:
  dmi.product.family: Alienware
  dmi.product.name: Alienware Aurora R5
  dmi.product.sku: 0729
  dmi.product.version: 1.0.19
  dmi.sys.vendor: Alienware

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