I have plugged in a USB Bluetooth dongle and can see it with lsusb and also in the Bluetooth menu in Zynthian but I am unable to select it. It shows up as Zynthian1 #1. The internal Bluetooth function (Zynthian1) can be selected and de-selected without problem. Has anyone else been able to activate a USB Bluetooth dongle? If not I’ll log a bug.
Thanks,
Harry
OK, I bought a Logitech M240 Bluetooth mouse and a Logitech UB500 USB dongle. The mouse won’t pair with the internal Bluetooth (in a plastic enclosure with mouse one inch from enclosure) and the UI won’t allow the USB dongle to be selected. I have already tried another Bluetooth mouse and USB dongle with the same result. Something definitely amiss here. Bug reports to follow.
The UB500 has no in-kernel driver. You may need to install it manually.
https://forums.raspberrypi.com/viewtopic.php?t=294634.
Then it works with the UI, but then you have two Bluetooth radios, which is not recommended. At least you should deactivate one for stability reasons.
If you do not want the internal Bluetooth to show up in the menu, go to Webconf > Hardware > Options Advanced view and add to the field Custom Config for Pi5:
dtoverlay=disable-bt-pi5
or for others:
dtoverlay=disable-bt
Save and reboot. Then the internal Bluetooth will be gone and the USB BT will show without a number added.