Sound routing is wrong when connecting multiple audio outputs

[Alessandro Campagni]

$ lsb_release -rd
Description: Ubuntu 20.04 LTS
Release: 20.04

$ apt-cache policy gnome-control-center
gnome-control-center:
  Installed: 1:3.36.1-1ubuntu5
  Candidate: 1:3.36.1-1ubuntu5
  Version table:
 *** 1:3.36.1-1ubuntu5 500
        500 http://uk-mirrors.evowise.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status

After updating to 20.04 I had issues reproducing sound with my bluetooth headphones.

Selecting the headphones as output device in the "sound" section of the gnome control center results in playing the sound from the laptop speaker.

I installed "pulse audio volume control" (package avucontrol/focal,now 4.0-1build1 amd64) and manually specified the built-in audio profile to "Off". This did the trick and I was able to reproduce sounds from my headset.

Please let me know if you need more information.

Thanks

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-control-center 1:3.36.1-1ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
Uname: Linux 5.4.0-28-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Fri May 1 14:23:34 2020
InstallationDate: Installed on 2019-02-24 (431 days ago)
InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
SourcePackage: gnome-control-center
UpgradeStatus: Upgraded to focal on 2020-04-28 (2 days ago)

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1866194, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

[Sebastien Bacher (seb128)]

Deleting ~/.config/pulse might workaround the issue