Everyone who want to send audio to an bluetooth receiver will face this issue.
Can we at least include the workaround from the wiki https://wiki.debia n.org/BluetoothUser/a2dp In order to prevent GDM from capturing the A2DP sink on session start, edit /var/lib/gdm3/.config/pulse/client.conf (or create it, if it doesn't exist): autospawn = no daemon-binary = /bin/true After that you have to grant access to this file to Debian-gdm user: # chown Debian-gdm:Debian-gdm /var/lib/gdm3/.config/pulse/client.conf