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Bug#1151097: linux-image-6.12.113+deb13-amd64: AR9271 802.11n stopped working

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Hi,

On Sat, Oct 17, 2026 at 09:27:19AM +0200, bug reports wrote:
> Package: src:linux
> Version: 6.12.113-1
> Severity: critical
> Tags: ipv6
> Justification: breaks unrelated software
> X-Debbugs-Cc: reportbug.fretful839@passinbox.com
> 
> Dear Maintainer,
> 
>    * What led up to the situation?
> 
> 	Kernel upgrade, from previous stable to the last one
> 	(linux-image-6.12.113+deb13-amd64) rendered '0cf3:9271
> 	Qualcomm Atheros Communications AR9271 802.11n' unusable,
> 	breaking all networking.
> 
>    * What exactly did you do (or not do) that was effective (or
>      ineffective)?
> 
> 	I have no time for bug chasing, I simply selected this working
> 	kernel from GRUB booting menu.
> 
>    * What was the outcome of this action?
>    * What outcome did you expect instead?

Please provide along the full kernel log from booting with the old and
new kernel up to triggering the problem.

I assume it is a regression from 6.12.111-1 to 6.12.113-1, so can you
please bisect as well with the following procedure:

    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 v6.12.111
    cp /boot/config-$(uname -r) .config
    yes '' | make localmodconfig
    make savedefconfig
    mv defconfig arch/x86/configs/my_defconfig

    # test 6.12.11 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 6.12.113 to ensure this is "bad"
    git checkout v6.12.113
    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 v6.12.111
    git bisect bad v6.12.113

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.

I found at least two related commits between 6.12.111 and 6.12.113 but
the above procedure will point us as the culprit commit.

Regards,
Salvatore

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Bug#1151097: linux-image-6.12.113+deb13-amd64: AR9271 802.11n stopped working Salvatore Bonaccorso <carnil@debian.org> - 2026-10-17 10:30 +0200

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