Thanks a lot for the input, Ken! You were right, it is not related to BT, but to the sound devices being added and removed.
I happend to have a Zoom microphone that can be connected as USB and creates a new audio interface (both input and output). Here are my new tests and findings: 1. Plug the Zoom USB device -> it appears in the Sound Settings Output Device and is automatically selected 2. Press Test and check the sound output -> the sound outputs on the internal speakers (NOK) After some investigation using pactl, I found how to fix the issue, for both the USB audio interface and the Bluetooth speaker: 1. Make sure the audio interface you want is connected (in my case, I connected both the USB and the Bluetooth speaker): $ pactl list short sinks 1 alsa_output.pci-0000_00_1f.3.analog-stereo module-alsa-card.c s16le 2ch 48000Hz SUSPENDED 6 alsa_output.usb-ZOOM_Corporation_H2n_000000000000-00.iec958-stereo module-alsa-card.c s16le 2ch 44100Hz SUSPENDED 7 bluez_sink.88_C6_26_1A_9E_AF.a2dp_sink module-bluez5-device.c s16le 2ch 44100Hz SUSPENDED 2. Play an audio stream, for instance a Youtube video. The output should come from the internal speakers, and can be seen in pactl as well: $ pactl list short sink-inputs 10 1 16 protocol-native.c float32le 2ch 44100Hz 3. Ask pactl to move the stream to the desired sink (output); for instance, the Bluetooth speaker: $ pactl move-sink-input 10 7 -> The sound outputs to the Bluetooth device! \o/ However, going back to Sound Settings (where the "Output Device" shows my Bluetooth Speaker) and clicking Test still outputs to the internal speakers.... Do you think it could be a GNOME issue? What should I do next? ** Summary changed: - After connecting a Bluetooth headset or speaker, it shows up in the sound output options but the sound keeps being emitted from the internal laptop speaker + After connecting an external output device (USB audio interface, Bluetooth speaker...), it shows up in the sound output options but the sound keeps being emitted from the internal laptop speaker ** Tags removed: a2dp -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1866194 Title: After connecting an external output device (USB audio interface, Bluetooth speaker...), it shows up in the sound output options but the sound keeps being emitted from the internal laptop speaker Status in pulseaudio package in Ubuntu: New Bug description: Ubuntu version: focal dev Kernel version: 5.4.0-14-generic #17-Ubuntu SMP Thu Feb 6 22:47:59 UTC 2020 Device CID: 201704-25503 Steps to reproduce: 1. Go to Bluetooth settings panel 2. Pair a BT device 3. Make sure it's marked as Connected, and go to the Sound settings 4. Make sure it's the one selected as "Output device" 5. Click "Test" -> the test sound outputs from the internal laptop speakers (NOK) 6. Select "Speakers - Built-in Audio" as Output device and click "Test" -> the test sound outputs from the internal laptop speakers (OK) 7. Try to switch back to the BT device and click Test -> same result as in step 5 Tested with 2 different BT devices (one headset and one speaker) Attached are btmon logs captured during the procedure described above, and pactl logs capture after step 7. Up to this morning, it was harder to connect the BT device, but once connected, the sound would output on it as expected. Now, the BT connection seems to work better, but I can't output the sound to the BT device... I tried to reboot the device, and also to suspend/resume, but in each case, the BT device can connect back, but the sound is still output from the internal laptop speakers, even when the BT device is selected in the Sound settings. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: pulseaudio 1:13.99.1-1ubuntu1 ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18 Uname: Linux 5.4.0-14-generic x86_64 ApportVersion: 2.20.11-0ubuntu18 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: pieq 1566 F.... pulseaudio /dev/snd/pcmC0D0c: pieq 1566 F...m pulseaudio /dev/snd/pcmC0D0p: pieq 1566 F...m pulseaudio CurrentDesktop: ubuntu:GNOME Date: Thu Mar 5 22:15:50 2020 InstallationDate: Installed on 2020-01-17 (48 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200116) SourcePackage: pulseaudio UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/23/2019 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.14.0 dmi.board.vendor: Dell Inc. dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.14.0:bd04/23/2019:svnDellInc.:pnInspiron7370:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct10:cvr: dmi.product.family: Inspiron dmi.product.name: Inspiron 7370 dmi.product.sku: 07E9 dmi.sys.vendor: Dell Inc. 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