Bluetooth speaker connects to Raspberry Pi 4 but plays no sound

[Swamp Thing]

• I am able to pair my Bluetooth speaker to my Raspberry Pi 4.
• I am able to select it as the current audio output by right clicking on the "speaker" icon, top left of desktop.
• Under "device profiles" the speaker's profile is shown as "High Fidelity Audio (A2DP Sink)".
• But when I play any media, the speaker is silent.
• Each time I press the volume up (+) key on the speaker, it plays the media for a short time (a fraction of a second).

Anything I can do to troubleshoot and fix this?

 

[Borg]

I haven't done anything like this before but the first thing that I would do is check to see if you have a proper driver installed on the Pi.

 

[Swamp Thing]

I haven't done anything like this before but the first thing that I would do is check to see if you have a proper driver installed on the Pi.

At least some of the driver stack is installed and working properly, because I am able to use Bluetooth earphones (2 or 3 different makes) without any problem.

I could still be missing some specific module that is needed for the speaker, though. I am googling this problem. The suggestions I found so far haven't helped.

 

[Swamp Thing]

I found this page ...
https://www.okdo.com/project/set-up-a-bluetooth-speaker-with-a-raspberry-pi/

I just ran the command suggested there:

sudo usermod -a -G bluetooth pi

and the speaker worked fine after a reboot.