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Bug#1147252: 6.12.107-1: analog jack stereo walks L/R (Meteor Lake SOF)

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  Bug#1147252: 6.12.107-1: analog jack stereo walks L/R (Meteor Lake SOF) Emilio <skl246@proton.me> - 2026-09-10 09:40 +0200
    Bug#1147252: 6.12.107-1: analog jack stereo walks L/R (Meteor Lake SOF) Salvatore Bonaccorso <carnil@debian.org> - 2026-09-15 15:00 +0200
    Processed: Re: Bug#1147252: 6.12.107-1: analog jack stereo walks  L/R (Meteor Lake SOF) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-09-15 15:00 +0200

#94054 — Bug#1147252: 6.12.107-1: analog jack stereo walks L/R (Meteor Lake SOF)

Source: linux
Version: 6.12.107-1
Severity: important
Tags: upstream
X-Debbugs-Cc: skl246@proton.me

Dear Maintainer,

Meteor Lake-P HD Audio (SOF / skl_hda_dsp_generic), analog 3.5mm jack.

After linux-image-amd64 6.12.94-1 -> 6.12.107-1 on a fresh Trixie install,
stereo image slowly walks L<->R on Headphones. Worse while typing.
Affects Lollypop (FLAC), Brave, Signal — not app-specific.
HDMI unused; default sink is Headphones. PipeWire 1.4.2.
Restarts of pipewire/wireplumber do not help.

Expected: stable stereo image on the jack, as on 6.12.94 and on a previous
install that already ran 6.12.107 without this drift.

*** End of the template - remove these template lines ***


-- System Information:
Debian Release: 13.6
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.107+deb13-amd64 (SMP w/22 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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#94090

Control: tags -1 + moreinfo

On Thu, Sep 10, 2026 at 09:28:29AM +0200, Emilio wrote:
> Source: linux
> Version: 6.12.107-1
> Severity: important
> Tags: upstream
> X-Debbugs-Cc: skl246@proton.me
> 
> Dear Maintainer,
> 
> Meteor Lake-P HD Audio (SOF / skl_hda_dsp_generic), analog 3.5mm jack.
> 
> After linux-image-amd64 6.12.94-1 -> 6.12.107-1 on a fresh Trixie install,
> stereo image slowly walks L<->R on Headphones. Worse while typing.
> Affects Lollypop (FLAC), Brave, Signal — not app-specific.
> HDMI unused; default sink is Headphones. PipeWire 1.4.2.
> Restarts of pipewire/wireplumber do not help.
> 
> Expected: stable stereo image on the jack, as on 6.12.94 and on a previous
> install that already ran 6.12.107 without this drift.

As you can clearly assert when the problem exists, can you please
bisect the issue? First it is best to narrow further down the affected
range, between 6.12.94-1 and 6.12.107-1 we had a couple of releases:

6.12.107-1
6.12.105-1
6.12.101-1
6.12.100-1
6.12.96-1
6.12.95-1
6.12.94-1

So let's first identify the range where on Debian releases the problem
is introduced. You can fetch older linux-image deb's from
https://snapshot.debian.org/package/linux-signed-amd64/ .

Assuming you have identified the regression is hypotetically between
6.12.96-1 and 6.12.100-1, then start the bisection as follows:

    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 v6.12.96
    cp /boot/config-$(uname -r) .config
    yes '' | make localmodconfig
    make savedefconfig
    mv defconfig arch/x86/configs/my_defconfig

    # test 6.12.96 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 6.12.100- to ensure this is "bad"
    git checkout v6.12.100
    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 v6.12.96
    git bisect bad v6.12.100

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.

After taht we will ideally have pointed out the breraking commit where
we can continue investigating and/or report upstream.

Regards,
Salvatore

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#94091 — Processed: Re: Bug#1147252: 6.12.107-1: analog jack stereo walks L/R (Meteor Lake SOF)

Processing control commands:

> tags -1 + moreinfo
Bug #1147252 [src:linux] 6.12.107-1: analog jack stereo walks L/R (Meteor Lake SOF)
Added tag(s) moreinfo.

-- 
1147252: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1147252
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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