[5.1.0.11][Xperia 10 III] Bluetooth speaker connects but no Media Audio - calls work though

Bug Reports
1

edit: All this is probably a result of my failed backup restore.

REPRODUCIBILITY: 99% (sometimes it works for a moment for no apparent reason but usually after some fiddling)
OS VERSION: 5.1.0.11
HARDWARE: Sony Xperia 10 III
UI LANGUAGE: EN
REGRESSION: I think so. Update 5.0 => 5.1

DESCRIPTION:

Bluetooth speakers connect fine but audio from media apps apparently is not routed there (calls are fine).

The same speaker (Tribit Stormbox 2) works fine on other hardware and has worked previously on this hardware and an X 10 II.

I think the update to 5.1 broke something.

PRECONDITIONS:

  • Tribit Stormbox 2 Bluetooth speaker (also my car radio)
  • Media app like gPodder or AllRadio2

STEPS TO REPRODUCE:

  1. Connect speaker to phone bluetooth => looks OK
  2. Start app
  3. Press play

EXPECTED RESULT:

Audio is routed to bluetooth speaker

ACTUAL RESULT:

Audio continues playing through the speaker or a cable-connected headphone. Rarely there’s no audio at all, usually after using Utilities => Restart Audio, Restart Bluetooth).

MODIFICATIONS:

Some patchmanager patches, some manual tweaking but nothing wrt BT or Pulseaudio

ADDITIONAL INFORMATION:

I tried

  • Utilities: restart both BT and Audio
  • Forse-restart pulseaudio with pulkseaudio -k
  • Reboot
  • systemctl --user restart pulseaudio.service
  • systemctl restart bluetooth.service
  • install Appsupport-BT (beta) (I don’t use this, installed solely for the purpose of trying to solve this problem)
  • full reboot
  • systemctl --user restart obex.service
  • installed pulsemixer via pip. Seems to work otherwise but I cannot manually switch to BT audio.

I have read the following topics:

rfkill
ID TYPE      DEVICE      SOFT      HARD
 0 bluetooth hci0   unblocked unblocked
 1 wlan      phy0     blocked unblocked
 2 bluetooth hci1   unblocked unblocked

I have collected some journalctl output during “trying to fix it”, separated into the following “chapters”:

Switching on Bluetooth
Switching on BT speaker
Now Connected
Launching Allradio2
Starting Playback
(Playback goes through phone speaker)
Stopping playback, shutting down Allradio2
Removing BT pairing
Searching for devices
And Connect
Launch Allradio2 again
Start playback
(Playback goes through phone speaker)
Close app
Utilities: Restart Audio
Launch Allradio2
Start Playback
(No audio at all!)
Close app
Bluetooth Off
Utilities: Restart Audio
Utilities: Restart BT
Utilities: Restart Audio
Switch on BT
Remove Pairing
Launch Allradio2
Start Playback
(Sound goes through phone speaker)
Close app
Start Gpodder
Start Playback
(Sound goes through phone speaker)
Close app
Disconnect BT speaker
Remove Pairing
Search for devices
Connect to Speaker, create pairing
Launch Allradio2
Start playback
(Sound goes through phone speaker)

I have uploaded it here.