Arch Linux

ComicSansMS

Member

Registered: 2025-09-08

Posts: 6

Bluetooth broke with upgrade to lts 6.12.45 - possible regression

Bluetooth stopped working for me after upgrading the lts kernel this morning. It works fine with both lts 6.12.44 and the non-lts 6.16.5. The machine is a Lenovo ThinkPad X1 Carbon Gen.13 with an Intel Bluetooth chip. Never had problems with Bluetooth before on that machine.

bluetoothctl gived me a 'No default controller available' with this kernel. lsmod shows the Bluetooth module loaded and I confirmed with rfkill that the feature is not hardware blocked.

journalctl does show a number of errors though, that I don't get on the other kernel versions:

kernel: Bluetooth: hci0: Device revision is 0
kernel: Bluetooth: hci0: Secure boot is enabled
kernel: Bluetooth: hci0: OTP lock is disabled
kernel: Bluetooth: hci0: API lock is enabled
kernel: Bluetooth: hci0: Debug lock is disabled
kernel: Bluetooth: hci0: Minimum firmware build 1 week 10 2014
kernel: Bluetooth: hci0: Bootloader timestamp 2022.18 buildtype 1 build 16362
kernel: Bluetooth: hci0: DSM reset method type: 0x00
kernel: Bluetooth: hci0: Found device firmware: intel/ibt-0093-0291.sfi
kernel: Bluetooth: hci0: Boot Address: 0x100800
kernel: Bluetooth: hci0: Firmware Version: 186-25.25
kernel: Bluetooth: hci0: Waiting for firmware download to complete
kernel: Bluetooth: hci0: Firmware loaded in 1777912 usecs
kernel: Bluetooth: hci0: Waiting for device to boot
kernel: Bluetooth: hci0: Device booted in 49809 usecs
kernel: Bluetooth: hci0: Found Intel DDC parameters: intel/ibt-0093-0291.ddc
kernel: Bluetooth: hci0: Failed to send Intel_Write_DDC (-16)
kernel: Bluetooth: hci0: Reading offload use cases failed (-16)
kernel: Bluetooth: hci0: Firmware timestamp 2025.25 buildtype 1 build 87482
kernel: Bluetooth: hci0: Firmware SHA1: 0x73cbad49
kernel: Bluetooth: hci0: Setting Intel event mask failed (-16)
kernel: Bluetooth: hci0: Reading supported features failed (-16)
kernel: Bluetooth: hci0: Error reading debug features
kernel: Bluetooth: hci0: Fseq status: Success (0x00)
kernel: Bluetooth: hci0: Fseq executed: 00.00.04.197
kernel: Bluetooth: hci0: Fseq BT Top: 00.00.04.197
kernel: Bluetooth: hci0: Opcode 0x0c03 failed: -16
kernel: Bluetooth: hci0: Failed to read MSFT supported features (-110)
kernel: Bluetooth: hci0: Hardware error 0x0f
kernel: Bluetooth: hci0: Reset after hardware error failed (-110)
kernel: Bluetooth: hci0: Reading Intel version command failed (-16)
kernel: Bluetooth: hci0: MSFT extension not registered

gromit

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From: Germany

Registered: 2024-02-10

Posts: 1,523

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Re: Bluetooth broke with upgrade to lts 6.12.45 - possible regression

Is this also an issue with the latest mainline release?

sudo pacman -U https://pkgbuild.com/~gromit/linux-bisection-kernels/linux-mainline-6.17rc5-1-x86_64.pkg.tar.zst

ComicSansMS

Member

Registered: 2025-09-08

Posts: 6

Re: Bluetooth broke with upgrade to lts 6.12.45 - possible regression

Is this also an issue with the latest mainline release?

sudo pacman -U https://pkgbuild.com/~gromit/linux-bisection-kernels/linux-mainline-6.17rc5-1-x86_64.pkg.tar.zst

Just booted with 6.17-rc5 from your link and Bluetooth is working fine there.

gromit

Administrator

From: Germany

Registered: 2024-02-10

Posts: 1,523

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Re: Bluetooth broke with upgrade to lts 6.12.45 - possible regression

Did you also confirm that downgrading to 6.12.44 fixes the issue again? You can use the Archive (https://wiki.archlinux.org/title/Arch_Linux_Archive) to downgrade (or the wrapper aur/downgrade)

ComicSansMS

Member

Registered: 2025-09-08

Posts: 6

Re: Bluetooth broke with upgrade to lts 6.12.45 - possible regression

I just double-checked everything again and indeed, the issue persists on 6.12.44 as well. I though I was using the lts kernel before, but I did not, apparently due to a hickup in the bootloader config on my side. So this is *not* a regression from 6.12.44, it seems that instead Bluetooth has not been working on lts.

Apologies for the confusion and thank you for probing me to double check my config for this!

gromit

Administrator

From: Germany

Registered: 2024-02-10

Posts: 1,523

Website

Re: Bluetooth broke with upgrade to lts 6.12.45 - possible regression

Could you go back until you find the first version that does not have the issue? If you can't pin it to a certain version, maybe also consider updates to the bluez stack and linux-firmware.