Re: asus-laptop: Fn hotkeys no longer work on ThinkPad SL400 after 378500dc1313 ("platform/x86: asus-laptop: Register ACPI notify handler directly")

[Mo Jun]

Hi Armin Wolf,

On Sun, Aug 30, 2026 at 7:59 PM Armin Wolf <W_Armin@xxxxxx> wrote:
>
> Am 30.08.26 um 10:42 schrieb Salvatore Bonaccorso:
>
> > Control: forwarded -1 https://lore.kernel.org/regressions/178807922598.807847.18300931641658404390@xxxxxxxxxxx
> > Control: tags -1 + upstream
> >
> > Hi
> >
> > In Debian, in https://bugs.debian.org/1146124, Jun Mo, reported the
> > following, with a bisection result:
> >
> > On Sun, Aug 30, 2026 at 12:59:45PM +0800, Jun MO wrote:
> >> Dear Maintainer,
> >>
> >> Fn hotkeys on Lenovo ThinkPad SL400, which are supported by the
> >> module asus-laptop, no longer work starting from Linux 7.1. Normally
> >> when those keys/key combinations are pressed,
> >> acpi_listen/kacpimon/"evtest
> >> /dev/input/by-path/platform-asus_laptop-event" will capture related
> >> events, for example:
> >>
> >> $ acpi_listen
> >> ^[[1;2Photkey ATK0101:00 00000032 00000000
> >> button/mute MUTE 00000080 00000000 K
> >> ^C
> >>
> >> Starting from Linux 7.1, there are not any related event captured by those command.
> >>
> >> Using snapshot.debian.org, I found out that the last working kernel version is 7.0.14-1 while the first not working version is 7.1~rc2-1~exp1.
> >>
> >> Following instructions in [1] and using /boot/config-7.0.14+deb14-amd64, a bisect resulted in:
> >>
> >> git bisect start
> >> # status: waiting for both 'good' and 'bad' commits
> >> # good: [458c6079fc1d41d564c37679c8ace02cd83ee817] Linux 7.0.14
> >> git bisect good 458c6079fc1d41d564c37679c8ace02cd83ee817
> >> # status: waiting for 'bad' commit, 1 'good' commit known
> >> # bad: [7fd2df204f342fc17d1a0bfcd474b24232fb0f32] Linux 7.1-rc2
> >> git bisect bad 7fd2df204f342fc17d1a0bfcd474b24232fb0f32
> >> # good: [028ef9c96e96197026887c0f092424679298aae8] Linux 7.0
> >> git bisect good 028ef9c96e96197026887c0f092424679298aae8
> >> # good: [334fbe734e687404f346eba7d5d96ed2b44d35ab] Merge tag 'mm-stable-2026-04-13-21-45' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
> >> git bisect good 334fbe734e687404f346eba7d5d96ed2b44d35ab
> >> # good: [cdd4dc3aebeab43a72ce0bc2b5bab6f0a80b97a5] Merge tag 'ntfs-for-7.1-rc1-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/linkinjeon/ntfs
> >> git bisect good cdd4dc3aebeab43a72ce0bc2b5bab6f0a80b97a5
> >> # bad: [beaba8bfbb91e3bb3133eacacd62fd6fea515e34] Merge tag 'probes-v7.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
> >> git bisect bad beaba8bfbb91e3bb3133eacacd62fd6fea515e34
> >> # good: [bea8d77e45a8b77f2beca1affc9aa7ed28f39b17] Merge tag 'staging-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
> >> git bisect good bea8d77e45a8b77f2beca1affc9aa7ed28f39b17
> >> # bad: [065c4e67cc2c40e6dd94649e8e720096fbabd4ee] Merge tag 'uml-for-7.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux
> >> git bisect bad 065c4e67cc2c40e6dd94649e8e720096fbabd4ee
> >> # good: [4b0b946019e7376752456380b67e54eea2f10a7c] Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
> >> git bisect good 4b0b946019e7376752456380b67e54eea2f10a7c
> >> # bad: [d6116d86e58a04a9522e349c4a27145521c01ad7] platform/x86: int3472: Use local variable for LED struct access
> >> git bisect bad d6116d86e58a04a9522e349c4a27145521c01ad7
> >> # good: [19ebacfb442b83aa5fe75f9c6851b4edbfff3760] platform/x86: dell/dell-rbtn: Convert ACPI driver to a platform one
> >> git bisect good 19ebacfb442b83aa5fe75f9c6851b4edbfff3760
> >> # bad: [378500dc1313e2c06a2f675bb00ab5d7880433ba] platform/x86: asus-laptop: Register ACPI notify handler directly
> >> git bisect bad 378500dc1313e2c06a2f675bb00ab5d7880433ba
> >> # good: [03ae0a0d0973b9e584a05136aab08fee2ef8e455] platform/x86: uniwill-laptop: Implement USB-C power priority setting
> >> git bisect good 03ae0a0d0973b9e584a05136aab08fee2ef8e455
> >> # good: [b0bcf48c74cc7f72d1b6effc7cecdae871b1785e] platform/x86: toshiba_acpi: Register ACPI notify handler directly
> >> git bisect good b0bcf48c74cc7f72d1b6effc7cecdae871b1785e
> >> # good: [553b2ac59fbb434330287fde0cabc64bc6f11ceb] platform/x86: toshiba_bluetooth: Convert ACPI driver to a platform one
> >> git bisect good 553b2ac59fbb434330287fde0cabc64bc6f11ceb
> >> # good: [3a96c7915d93231e128df74901fe8fcb960b0ecb] platform/x86: toshiba_haps: Convert ACPI driver to a platform one
> >> git bisect good 3a96c7915d93231e128df74901fe8fcb960b0ecb
> >> # first 'bad' commit: [378500dc1313e2c06a2f675bb00ab5d7880433ba] platform/x86: asus-laptop: Register ACPI notify handler directly
> >>
> >> [1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1143721#15
> > #regzbot introduced: 378500dc1313e2c06a2f675bb00ab5d7880433ba
> > #regzbot link: https://bugs.debian.org/1146124
> >
> > Does this rings a bell?
>
> I think i found the culprit, could you please test the attached patch?

Build the module with the patch(only "make -C .
M=drivers/platform/x86") and load the built
drivers/platform/x86/asus-laptop.ko, now the Fn hotkeys works again.

Thanks!

Regards,
Jun MO

>
> Thanks,
> Armin Wolf
>
> >
> > Regards,
> > Salvatore
> >