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Bug#1147177: linux-image-amd64: audio crackling/dropout on Meteor Lake HDA after 6.12.94 -> 6.12.107 upgrade

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  Bug#1147177: linux-image-amd64: audio crackling/dropout on Meteor Lake HDA after 6.12.94 -> 6.12.107 upgrade Salvatore Bonaccorso <carnil@debian.org> - 2026-09-15 15:10 +0200
    Processed: Re: Bug#1147177: linux-image-amd64: audio  crackling/dropout on Meteor Lake HDA after 6.12.94 -> 6.12.107 upgrade "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-09-15 15:10 +0200

#94092 — Bug#1147177: linux-image-amd64: audio crackling/dropout on Meteor Lake HDA after 6.12.94 -> 6.12.107 upgrade

Control: tags -1 + moreinfo

Hi Emilio

On Tue, Sep 08, 2026 at 10:29:22PM +0200, Emilio wrote:
> Package: linux-image-amd64
> Version: 6.12.107-1
> Severity: normal
> X-Debbugs-Cc: debian-amd64@lists.debian.org, skl246@proton.me
> User: debian-amd64@lists.debian.org
> Usertags: amd64
> 
> Dear Maintainer,
> 
> Audio crackling/dropout on Meteor Lake HDA (Asus Zenbook UX3405MA) after
> upgrading kernel 6.12.94 -> 6.12.107. Powered studio monitors connected via
> headphone jack, wobble/dropout occurs intermittently when a second audio
> stream plays while typing. Ruled out ground loop (persists on battery),
> pinned PipeWire quantum to 1024 (no change), no RT scheduling errors in
> journalctl. Kernel 6.12.94 does not exhibit the issue; 6.12.107 does.

For this one similar to #1147252 I propose to bisect the issue.

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

Regards,
Salvatore

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#94093 — Processed: Re: Bug#1147177: linux-image-amd64: audio crackling/dropout on Meteor Lake HDA after 6.12.94 -> 6.12.107 upgrade

Processing control commands:

> tags -1 + moreinfo
Bug #1147177 [src:linux] linux-image-amd64: audio crackling/dropout on Meteor Lake HDA after 6.12.94 -> 6.12.107 upgrade
Added tag(s) moreinfo.

-- 
1147177: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1147177
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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