Bluez doesn't work well with Multipoint Audio Devices

[Kai Mast]

Modern bluetooth devices allow to connect to multiple computers at once (aka "multi-point"). My headset, for example, can connect to my cell phone and my laptop at the same time. Connecting actually works fairly well with bluez.

The desired behaviour is the following: When I try to play audio on one device it should play on the bluetooth headphones unless the other device is already playing audio.

However, with my current setup this doesn't work well.

Steps to repproduce
1. I play some youtube video on my laptop
2. I stop the video (and even close the tab)
3. I start playing musing on phone

Expected:
4. I can hear the phone's music on my headphones

Actual:
4. I cannot hear the phones music until I turn bluetooth on my laptop of or switch the output device in the sound panel.

I am on Ubuntu 20.04, my headphones are the Bose 700, and my phone is just a regular Android device.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1863958

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.