see https://unix.stackexchange.com/questions/437468/bluetooth-headset-volume-too-low-only-in-arch
==Reproducer==
1) install Ubuntu 20.4
2) pair with a set of Apple AirPods
3) try to listen to some video
4) put volume up to maximum and repeat 3)
5) turn on volume boost and repeat 4)
==Actual result==
at any stage 3, 4 or 5 the audio from the AirPods is extremely quiet, almost too low to hear (though after 5 it becomes audible in a quiet environment)
==Expected result===
It should be possible to hear the sound through the AirPods by default.
==Comment==
The following instructions from the stack exchange answer fix the problem
Edit
/lib/systemd/system/bluetooth.service
and change
ExecStart=/usr/lib/bluetooth/bluetoothd
to
ExecStart=/usr/lib/bluetooth/bluetoothd --noplugin=avrcp
==Version information==
$ lsb_release -rd
Description: Ubuntu 20.04.3 LTS
Release: 20.04
$ apt-cache policy bluez
bluez:
Installed: 5.53-0ubuntu3.3
Candidate: 5.53-0ubuntu3.3
Version table:
*** 5.53-0ubuntu3.3 500
500 http://gb.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
100 /var/lib/dpkg/status
5.53-0ubuntu3.2 500
500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
5.53-0ubuntu3 500
500 http://gb.archive.ubuntu.com/ubuntu focal/main amd64 Packages
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: mikedlr 1608 F.... pulseaudio
/dev/snd/controlC0: mikedlr 1608 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2021-08-07 (51 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
MachineType: Dell Inc. XPS 13 9370
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.11.0-34-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.11.0-34.36~20.04.1-generic 5.11.22
RelatedPackageVersions:
linux-restricted-modules-5.11.0-34-generic N/A
linux-backports-modules-5.11.0-34-generic N/A
linux-firmware 1.187.16
Tags: focal
Uname: Linux 5.11.0-34-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 08/09/2018
dmi.bios.release: 1.5
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.5.1
dmi.board.name: 0F6P3V
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.5.1:bd08/09/2018:br1.5:svnDellInc.:pnXPS139370:pvr:sku07E6:rvnDellInc.:rn0F6P3V:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 9370
dmi.product.sku: 07E6
dmi.sys.vendor: Dell Inc.
The laptop hardware this is done on is a Dell XPS-13, though I suppose this shouldn't make a difference.