Raspberry Pi bluetooth audio problem after upgrade

[Swamp Thing]

TL;DR

After an update & upgrade, the Pi is still able to pair with bluetooth audio devices BUT now the volume button and slider are disabled. No audio.

Raspberry Pi 3 with Raspberry OS...

Recently did apt-get update and upgrade. It did an upgrade of the desktop after asking for permission to replace the file piwiz.desktop. It then ran a wizard to redo various options and preferences, including WiFi and password (which I had set up initially on first running the OS).

Now I can't use bluetooth audio. I can pair a speaker or headphone as before, but the speaker icon in the lower right is greyed out. I can right click and select my device from the list of audio devices. It goes through without error. But the speaker icon is still greyed out.

If I click on the speaker icon it shows the "mute" box checked and volume at zero, which I can't change. If I hover over the speaker icon it pops up "no volume control on this device".

I found this command on the internet that is supposed to give some clues:

pi@raspberrypi:~ $ systemctl status bluetooth
● bluetooth.service - Bluetooth service
   Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2020-12-09 14:46:56 IST; 38min ago
     Docs: man:bluetoothd(8)
Main PID: 627 (bluetoothd)
   Status: "Running"
    Tasks: 1 (limit: 2063)
   CGroup: /system.slice/bluetooth.service
           └─627 /usr/lib/bluetooth/bluetoothd

Dec 09 14:48:41 raspberrypi bluetoothd[627]: /org/bluez/hci0/dev_5A_5A_52_A6_01_64/fd2: fd(26) ready
Dec 09 14:49:01 raspberrypi bluetoothd[627]: Unable to get io data for Headset Voice gateway: getpeername: Transport endpoint is not connected (107)
Dec 09 14:49:22 raspberrypi bluetoothd[627]: /org/bluez/hci0/dev_5A_5A_52_A6_01_64/fd3: fd(26) ready
Dec 09 14:50:19 raspberrypi bluetoothd[627]: /org/bluez/hci0/dev_5A_5A_52_A6_01_64/fd4: fd(26) ready
Dec 09 14:58:06 raspberrypi bluetoothd[627]: Unable to get io data for Headset Voice gateway: getpeername: Transport endpoint is not connected (107)
Dec 09 14:58:51 raspberrypi bluetoothd[627]: /org/bluez/hci0/dev_5A_5A_52_A6_01_64/fd5: fd(26) ready
Dec 09 14:59:50 raspberrypi bluetoothd[627]: Unable to get io data for Headset Voice gateway: getpeername: Transport endpoint is not connected (107)
Dec 09 15:00:23 raspberrypi bluetoothd[627]: Unable to get Headset Voice gateway SDP record: Host is down
Dec 09 15:00:43 raspberrypi bluetoothd[627]: /org/bluez/hci0/dev_18_48_59_3C_60_20/fd6: fd(24) ready
Dec 09 15:13:27 raspberrypi bluetoothd[627]: /org/bluez/hci0/dev_5A_5A_52_A6_01_64/fd8: fd(26) ready

Any suggestions on fixing this?

 

[Swamp Thing]

OK, a subsequent upgrade has fixed the problem.