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FS#76341 - After upgrade to 6.0.5 bluetooth stopped working

Attached to Project: Arch Linux
Opened by gudvinr (gudvinr) - Saturday, 29 October 2022, 14:20 GMT
Last edited by Toolybird (Toolybird) - Thursday, 01 December 2022, 19:44 GMT
Task Type Bug Report
Category Kernel
Status Closed
Assigned To No-one
Architecture x86_64
Severity High
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 1
Private No


Yesterday bluetooth was working but I updated kernel that day (from 6.0.2 to 6.0.5) and now after boot with new kernel I am getting error in dmesg:

Oct 29 17:01:55 kernel: Bluetooth: hci0: command 0xfc05 tx timeout
Oct 29 17:01:55 kernel: Bluetooth: hci0: Reading Intel version command failed (-110)

And before that (previous boot with same kernel):

Oct 29 16:33:19 kernel: Bluetooth: hci0: Reading Intel version command failed (-16)

I have PCIe WiFi/BT card (Intel 8265 / 8275). WiFi works fine.

linux-firmware package has version 20220913 and it was installed before too.

By the look of it, I think breaking changes were introduced in 6.0.3 because both 6.0.4 and 6.0.5 do not have changes related to bluetooth but 6.0.3 does:
This task depends upon

Closed by  Toolybird (Toolybird)
Thursday, 01 December 2022, 19:44 GMT
Reason for closing:  Fixed
Additional comments about closing:  See comments
Comment by Toolybird (Toolybird) - Sunday, 30 October 2022, 01:02 GMT
Possibly related ?

The standard set of recommendations for kernel regressions:

- if there is a new kernel in the "testing" repo, try it to see if resolved
- try a precompiled mainline kernel. See the pinned comment here [1]
- report it upstream, either to the kernel bugzilla or to the relevant mailing list (in this case "linux-bluetooth")
- follow the wiki instructions for kernel troubleshooting [2]
- if you're prepared to get "down and dirty", you can perform a git bisection [3] to find the offending commit which can then be reported upstream
- visit the proper Arch support channels (forum/IRC/mailing lists/reddit/etc). You can often find incredibly helpful folks there who will, if you're lucky, even offer to perform a git bisection for you (Hi @loqs! :)
- stay on the last working kernel and hope that a) it gets fixed in a future update or b) someone else comes along and puts in the required effort

Please let us know what you find out.

Comment by gudvinr (gudvinr) - Sunday, 30 October 2022, 17:10 GMT
It does seem related, yes. But I only had this issue since 2022-10-29 and I do cold power off (with switching off power to PC) daily.
This issue seem to be happening since 5.15 kernel which was released last year.

For now I resort to using 6.0.2 and will upgrade to 6.0.6 from testing when I have time for that. However, I do not see any bluetooth related changes there:

I didn't report to kernel bugzilla because it says "If you did not compile your own kernel from scratch, you are probably in the wrong place".
Comment by gudvinr (gudvinr) - Tuesday, 01 November 2022, 10:28 GMT
So, I upgraded to 6.0.6 and it didn't fix bluetooth.

I'll try mainline kernel next I guess.
Comment by Toolybird (Toolybird) - Thursday, 01 December 2022, 00:05 GMT
Is this still happening with latest kernels?
Comment by gudvinr (gudvinr) - Thursday, 01 December 2022, 17:54 GMT
It seems to be working now in 6.0.10 although I still have no idea what exactly fixed it.
There was a bunch of other updates, including bluez and linux-firmware.