Arch Linux

Incog

Member

Registered: 2025-03-11

Posts: 3

Bluetooth adapter not detected

I currently have linux , linux-lts and linux-zen kernel  . Bluetooth works on the linux-zen 6.12 kernel but from linux-zen 6.13 and onwards , bluetooth adapter is not detected and hence bluetooth doesn't work . Bluetooth adapter is also not detected on the linux-lts and linux kernels .
I have dual boot with Windows but nothing on windows is set up to block bluetooth on my Linux and I have no problem when i downgrade linux-zen to 6.12.10 but when i upgrade the kernel to 6.13 and onwards, I face this issue

=> rfkill list
0: acer-wireless: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: acer-bluetooth: Bluetooth
    Soft blocked: no
    Hard blocked: no
2: hci0: Bluetooth
    Soft blocked: no
    Hard blocked: no
3: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no

Last edited by Incog (2025-04-22 02:57:35)

gromit

Administrator

From: Germany

Registered: 2024-02-10

Posts: 1,348

Website

Re: Bluetooth adapter not detected

Does it also work with the plain 6.12 kernel?

sudo pacman -U https://archive.archlinux.org/packages/l/linux/linux-6.12.arch1-1-x86_64.pkg.tar.zst

Also could you try the latest mainline release to see if it's already fixed there?

sudo pacman -U https://pkgbuild.com/~gromit/linux-bisection-kernels/linux-mainline-6.15rc3-1-x86_64.pkg.tar.zst

Incog

Member

Registered: 2025-03-11

Posts: 3

Re: Bluetooth adapter not detected

Does it also work with the plain 6.12 kernel?

sudo pacman -U https://archive.archlinux.org/packages/l/linux/linux-6.12.arch1-1-x86_64.pkg.tar.zst

Also could you try the latest mainline release to see if it's already fixed there?

sudo pacman -U https://pkgbuild.com/~gromit/linux-bisection-kernels/linux-mainline-6.15rc3-1-x86_64.pkg.tar.zst

It does work with the plain linux 6.12 kernel and the linux-lts 6.12.12-1 kernel  but not for newer kernels than the previously mentioned versions and it also doesn't work in the latest mainline 6.15rc3 release

gromit

Administrator

From: Germany

Registered: 2024-02-10

Posts: 1,348

Website

Re: Bluetooth adapter not detected

This could be a kernel regression, which should be bisected and reported to the upstream kernel developers

Are you confident to do the bisection on your own or do you need some help?
If you want we could also provide you with pre-built kernel images for you to test (which greatly speeds up the test time)  

Good info to get you started is:
- https://docs.kernel.org/admin-guide/rep … sions.html
- https://wiki.archlinux.org/title/Kernel … egressions

Incog

Member

Registered: 2025-03-11

Posts: 3

Re: Bluetooth adapter not detected

This could be a kernel regression, which should be bisected and reported to the upstream kernel developers

Are you confident to do the bisection on your own or do you need some help?
If you want we could also provide you with pre-built kernel images for you to test (which greatly speeds up the test time)  

Good info to get you started is:
- https://docs.kernel.org/admin-guide/rep … sions.html
- https://wiki.archlinux.org/title/Kernel … egressions

I need some guidance to perform the bisection and the process involved and I am all for it and btw which kernel should i bisect ?
Sorry for the late response

Last edited by Incog (2025-05-05 12:35:26)

gromit

Administrator

From: Germany

Registered: 2024-02-10

Posts: 1,348

Website

Re: Bluetooth adapter not detected

Sorry for letting you wait for so long! Here is the first revision to test:

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-v6.12.r7749.g28eb75e-1-x86_64.pkg.tar.zst

Depending on your system's boot mechanism you need to manually add an entry for linux-mainline.

nxtkofi

Member

Registered: 2025-10-27

Posts: 1

Re: Bluetooth adapter not detected

Hi. I stumbled upon this issue myself and I can perform a few tests. I hope my contribution helps resolve this issue. Downgrading the kernel from 6.12.53-lts to 6.12.12-lts helped me resolve this issue. I am now downloading version that You provided and I will post an update in about 10 minutes after I reboot the system to load changes.

EDIT: Can confirm that BLE devices are properly being detected with mainline  version that You provided
EDIT2: I just realized that I misread the title and content of this post. My issue was related to a MediaTek MT7922 detecting BLE devices on linux kernel 6.12.12 but not on 6.12.53. Anyway I am happy to help if there is appropriate thread on the forum.

Last edited by nxtkofi (2025-10-27 22:00:47)