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Bug#1124605: bugs.debian.org: ThinkPad 16s fails to suspend because of mt7925e

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Hi 

On Sun, Jan 04, 2026 at 12:49:13AM +0000, Luboš Bouček wrote:
> With this kernel:
> 
> $ uname -r
> 6.17.13+deb13-amd64
> 
> The laptop seems to suspend correctly, thanks!

Ok that are great news.

Can you do further debugging on this issue? I see three major steps,
each in case of debugging "success".

- narrow down more the affected range of Debian versions where the
  issue got fixed.
- Bisect the upstream changes to identify a fixing commit
- Check if the commit can be backported to 6.12.y and resolving the
  issue.

I will outline only the first two first. So between 6.12.57-1 and
6.17.13-1 there are a couple of linux uploads happened:

6.17.13-1
6.17.13-1~bpo13+1
6.17.12-1
6.17.11-1
6.17.10-1
6.17.9-1
6.17.8-1
6.17.8-1~bpo13+1
6.17.7-2
6.17.7-1
6.17.6-1
6.17.5-1~exp1
6.17.2-1~exp1
6.16.12-2
6.16.12-1
6.16.12-1~bpo13+1
6.16.11-1
6.16.10-1
6.16.9-1
6.16.8-1
6.16.7-1
6.16.6-1
6.16.5-1
6.16.3-1
6.16.3-1~bpo13+1
6.16.1-1~exp1
6.16-1~exp1
6.16~rc7-1~exp1
6.15.6-1~exp1
6.15.5-1~exp1
6.15.4-1~exp1
6.15.3-1~exp1
6.15.2-1~exp1
6.15.1-1~exp1
6.15-1~exp1
6.15~rc7-1~exp1
6.14.6-1~exp1
6.14.5-1~exp1
6.14.3-1~exp1
6.13.11-1~exp1
6.13.10-1~exp1
6.13.9-1~exp1
6.13.8-1~exp1
6.13.7-1~exp1
6.13.6-1~exp1
6.13.5-1~exp1
6.13.4-1~exp1
6.13.3-1~exp1
6.13.2-1~exp1
6.13~rc7-1~exp1
6.13~rc6-1~exp1
6.12.63-1
6.12.57-1

From https://snapshot.debian.org/ you can fetch earlier and seen
uploads.so by querying
https://snapshot.debian.org/package/linux-signed-amd64/ you can get
earlier linux-image packages. 

The idea would be to now do a "manual" bisect of those changes
identifying at least a major version range where things changes.

Assume you found that, by first searching and testing the major
version bumps that 6.13~rc7-1~exp1 exposes the problem but
6.14.3-1~exp1 will not anymore.

The next step would be to test the equivalent upstream versions and
check that this still holds true and then start the bisection. This
can be done as follows, again remember with the hypotetical above
versions (adapt as needed), and it would involve compiling and testing
a few kernels:

    git clone https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
    cd linux-stable
    git checkout v6.14.3
    cp /boot/config-$(uname -r) .config
    yes '' | make localmodconfig
    make savedefconfig
    mv defconfig arch/x86/configs/my_defconfig

    # test 6.14.3 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 6.13~rc7 to ensure this is "bad"
    git checkout v6.13-rc7
    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 --term-new=fixed --term-old=broken
    git bisect fixed v6.14.3
    git bisect broken v6.13-rc7

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, try to boot / verify if problem exists

and if the problem is hit run:

    git bisect broken

and if the problem doesn't trigger run:

    git bisect fixed

. 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 'fixed'
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.

Can you please do this bisect?

Regards,
Salvatore

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Bug#1124605: bugs.debian.org: ThinkPad 16s fails to suspend because of mt7925e Salvatore Bonaccorso <carnil@debian.org> - 2026-01-03 22:10 +0100
  Bug#1124605: bugs.debian.org: ThinkPad 16s fails to suspend because of mt7925e Luboš Bouček <boucek.lubos@protonmail.com> - 2026-01-04 02:00 +0100
    Bug#1124605: bugs.debian.org: ThinkPad 16s fails to suspend because of mt7925e Salvatore Bonaccorso <carnil@debian.org> - 2026-01-04 06:40 +0100
      Bug#1124605: bugs.debian.org: ThinkPad 16s fails to suspend because of mt7925e Luboš Bouček <boucek.lubos@protonmail.com> - 2026-01-04 10:50 +0100

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