Bluetooth error: br-connection-unknown

[lakshayrohila]

I've just freshly installed 24.10 Kubuntu, deleting my previous 24.04 installation. Apart from a few issues here are there, some freezes and some crashes, I think there is quite a lot improvement from the previous version (thanks devs!!).

Coming to the point, I tried connecting to my Boat Rockerz bluetooth neckband, but it didn't work (the bt neckband did connect in 24.04). Trying to connect from the system settings -> Bluetooth, I get br-connection-unknown. Since many a times, these errors are resolved by forgetting the bt device from the laptop and also making the bt device forget the laptop by connecting to another phone/laptop, I did so and then performed the above steps again - but got the same error.

I also tried to connect manually through bluetoothctl, but I still have the same issue. Here is the bluetoothctl output:

$ bluetoothctl
Waiting to connect to bluetoothd...[bluetooth]# Agent registered
[bluetooth]# scan on
[bluetooth]# SetDiscoveryFilter success
[bluetooth]# Discovery started
[bluetooth]# [CHG] Controller 94:B8:6D:6E:31:78 Discovering: yes
[bluetooth]# [NEW] Device 11:11:22:CC:94:F4 boAt Rockerz
[bluetooth]# trust 11:11:22:CC:94:F4
[bluetooth]# [CHG] Device 11:11:22:CC:94:F4 Trusted: yes
[bluetooth]# Changing 11:11:22:CC:94:F4 trust succeeded
[bluetooth]# pair 11:11:22:CC:94:F4
Attempting to pair with 11:11:22:CC:94:F4
[CHG] Device 11:11:22:CC:94:F4 Connected: yes
[boAt Rockerz]# [CHG] Device 11:11:22:CC:94:F4 Bonded: yes
[boAt Rockerz]# [CHG] Device 11:11:22:CC:94:F4 ServicesResolved: yes
[boAt Rockerz]# [CHG] Device 11:11:22:CC:94:F4 Paired: yes
[boAt Rockerz]# Pairing successful
[boAt Rockerz]# [CHG] Device 11:11:22:CC:94:F4 ServicesResolved: no
[CHG] Device 11:11:22:CC:94:F4 Connected: no
[bluetooth]# connect 11:11:22:CC:94:F4
Attempting to connect to 11:11:22:CC:94:F4
[CHG] Device 11:11:22:CC:94:F4 Connected: yes
[boAt Rockerz]# Failed to connect: org.bluez.Error.Failed br-connection-unknown
[CHG] Device 11:11:22:CC:94:F4 Connected: no
[bluetooth]#

Please help me resolve this issue.

Thanks in advance!

[lakshayrohila]

I found another info that can be useful. These are the errors shown at the bottom of the output of the command systemctl status bluetooth:

... bluetoothd[6192]: src/profile.c:ext_connect() Hands-Free Voice gateway failed connect to 11:11:22:CC:94:F4: Connection refused (111)
... bluetoothd[6192]: profiles/audio/avdtp.c:avdtp_connect_cb() connect to 11:11:22:CC:94:F4: Connection refused (111)
... bluetoothd[6192]: profiles/audio/avdtp.c:avdtp_connect_cb() connect to 11:11:22:CC:94:F4: Connection refused (111)

[lakshayrohila]

Another info: I can connect to other (Sony) bluetooth headphones, but not these ones.

[montaropdf]

Hello,

I am in Kubuntu 24.04.1 LTS x86_64, since a few weeks I have the same issue with my Logitech z407 Speaker system.

[montaropdf]

Hello,

As of today bluetooth is working again.

I use a bluetooth dongle. I had to unplug it an replug it to a different port for it to work. Once it has worked with that port, it worked again with the original port I was using. As I struggle to use my Librem Key (a variant of the Nitrokey Pro 2, made by Purism), since the same period of time, I wonder if their is not something fishy with USB port management, in the first place.

[montaropdf]

lakshayrohila, did had a look into the output of `dmesg -w`?

There you could find other informations regarding the behavior of your devices.