Bluetooth adaptor not reconised in F35 KDE spin since kernel 5.15.*

Ask Fedora
1

My bluetooth adapter was recognised and working on this machine until the kernel updated to 5.15. I’ve kept the last of the 5.14 series kernel and bluetooth still works when I reboot with that, but none of the 5.15 kernels recognise my adapter.

If anyone can help, let me know what details of my setup you need and I will post it.

2

Is Bluetooth adapter is internal or USB…?

3

It’s internal

4

Hi, would you like to post journalctl -k -b | grep -i bluetooth. May be we could get some useful information from there. Also it will be lot helpful if you could post the result from both kernels.

5

I believe this is a known issue with 5.15, hopefully we will get a fix soon. Check if the radio picks back up on a cold boot (not reboot–complete shutdown, wait a few seconds, then boot).

6

Here is the output from that command while booted in kernel 5.15.12:
Jan 09 22:57:47 freebird kernel: Bluetooth: Core ver 2.22
Jan 09 22:57:47 freebird kernel: NET: Registered PF_BLUETOOTH protocol family
Jan 09 22:57:47 freebird kernel: Bluetooth: HCI device and connection manager initialized
Jan 09 22:57:47 freebird kernel: Bluetooth: HCI socket layer initialized
Jan 09 22:57:47 freebird kernel: Bluetooth: L2CAP socket layer initialized
Jan 09 22:57:47 freebird kernel: Bluetooth: SCO socket layer initialized
Jan 09 22:57:48 freebird kernel: Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Jan 09 22:57:48 freebird kernel: Bluetooth: BNEP filters: protocol multicast
Jan 09 22:57:48 freebird kernel: Bluetooth: BNEP socket layer initialized
Jan 09 22:57:49 freebird kernel: Bluetooth: hci0: command 0xfc05 tx timeout
Jan 09 22:57:49 freebird kernel: Bluetooth: hci0: Reading Intel version command failed (-110)

7

And the command output when in kernel 5.14.18:
Jan 11 16:39:25 freebird kernel: Bluetooth: Core ver 2.22
Jan 11 16:39:25 freebird kernel: NET: Registered PF_BLUETOOTH protocol family
Jan 11 16:39:25 freebird kernel: Bluetooth: HCI device and connection manager initialized
Jan 11 16:39:25 freebird kernel: Bluetooth: HCI socket layer initialized
Jan 11 16:39:25 freebird kernel: Bluetooth: L2CAP socket layer initialized
Jan 11 16:39:25 freebird kernel: Bluetooth: SCO socket layer initialized
Jan 11 16:39:25 freebird kernel: Bluetooth: hci0: read Intel version: 370810011003110e32
Jan 11 16:39:25 freebird kernel: Bluetooth: hci0: Intel device is already patched. patch num: 32
Jan 11 16:39:26 freebird kernel: Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Jan 11 16:39:26 freebird kernel: Bluetooth: BNEP filters: protocol multicast
Jan 11 16:39:26 freebird kernel: Bluetooth: BNEP socket layer initialized
Jan 11 16:39:49 freebird kernel: Bluetooth: RFCOMM TTY layer initialized
Jan 11 16:39:49 freebird kernel: Bluetooth: RFCOMM socket layer initialized
Jan 11 16:39:49 freebird kernel: Bluetooth: RFCOMM ver 1.11

8

Look like what @bluishhumility said was right. You could read on kernel.org bugzilla. It have same dmesg error report:

[testcase@fedora Downloads]$ cat dmesg_5.15.5-1.g83fc974-default.txt | grep -i bluetooth
[    4.482797] Bluetooth: Core ver 2.22
[    4.482846] NET: Registered PF_BLUETOOTH protocol family
[    4.482852] Bluetooth: HCI device and connection manager initialized
[    4.482859] Bluetooth: HCI socket layer initialized
[    4.482864] Bluetooth: L2CAP socket layer initialized
[    4.482884] Bluetooth: SCO socket layer initialized
[    6.697572] Bluetooth: hci0: Reading Intel version command failed (-110)
...
9

@bluishhumility Interesting, bluetooth works after a cold boot but not on a reboot.

FWIW, I updated to 5.15.13 this morning and the issue is still there.