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Bug#1149377: linux-image-6.12.111+deb13-amd64: Bluetooth no longer works after kernel upgrade

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Hi Erik

On Tue, Sep 29, 2026 at 08:05:02PM +0200, Erik Brangs wrote:
> Package: src:linux
> Version: 6.12.111-1
> Severity: normal
> X-Debbugs-Cc: debian-amd64@lists.debian.org, erik.brangs@gmx.de
> User: debian-amd64@lists.debian.org
> Usertags: amd64
> 
> Dear Maintainer,
> 
> #   * What led up to the situation?
> I upgraded to the kernel 6.12.111 on my desktop computer. After the upgrade, bluetooth no longer worked.
> #   * What exactly did you do (or not do) that was effective (or
> #     ineffective)?
> 
> I rebooted the computer and selected the old kernel, 6.12.107, from the boot menu. After booting the old kernel, bluetooth worked again.
> #   * What outcome did you expect instead?
> 
> I would expect bluetooth to work with the current kernel.

Yes understandable. It would be great if you could bisect the problem. That would involve
compiling and testing a few kernels

    git clone --single-branch -b linux-6.12.y https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
    cd linux-stable
    git checkout v6.12.107
    cp /boot/config-$(uname -r) .config
    yes '' | make localmodconfig
    make savedefconfig
    mv defconfig arch/x86/configs/my_defconfig

    # test 6.12.107 to ensure this is "good"
    make my_defconfig
    make -j $(nproc) bindeb-pkg
    ... install the resulting .deb package and confirm problem does not exist

    # test 6.12.111 to ensure this is "bad"
    git checkout v6.12.111
    make my_defconfig
    make -j $(nproc) bindeb-pkg
    ... install the resulting .deb package and confirm problem exists

With that confirmed, the bisection can start:

    git bisect start
    git bisect good v6.12.107
    git bisect bad v6.12.111

In each bisection step git checks out a state between the oldest
known-bad and the newest known-good commit. In each step test using:

    make my_defconfig
    make -j $(nproc) bindeb-pkg
    ... install, verify if problem exists

and if the problem is hit run:

    git bisect bad

and if the problem doesn't trigger run:

    git bisect good

. Please pay attention to always select the just built kernel for
booting, it won't always be the default kernel picked up by grub.

Iterate until git announces to have identified the first bad commit.

Then provide the output of

    git bisect log

In the course of the bisection you might have to uninstall previous
kernels again to not exhaust the disk space in /boot. Also in the end
uninstall all self-built kernels again.

Regards,
Salvatore

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Bug#1149377: linux-image-6.12.111+deb13-amd64: Bluetooth no longer works after kernel upgrade Salvatore Bonaccorso <carnil@debian.org> - 2026-09-30 17:10 +0200
  Processed: Re: Bug#1149377: linux-image-6.12.111+deb13-amd64:  Bluetooth no longer works after kernel upgrade "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-09-30 17:10 +0200
  Bug#1149377: linux-image-6.12.111+deb13-amd64: Bluetooth no longer works after kernel upgrade Salvatore Bonaccorso <carnil@debian.org> - 2026-09-30 22:30 +0200
    Processed: Re: Bug#1149377: linux-image-6.12.111+deb13-amd64:  Bluetooth no longer works after kernel upgrade "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-09-30 22:30 +0200
    Bug#1149377: linux-image-6.12.111+deb13-amd64: Bluetooth no longer works after kernel upgrade Salvatore Bonaccorso <carnil@debian.org> - 2026-10-01 09:40 +0200

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