[SOLVED] backlight Laptop buttons stopped working

gaelic · 2024-09-06 11:26:54

I am sometimes using the hardware buttons of my Thinkpad z13 (AMD APU) to adjust the screen brightness, but not very often. Since a while they (FN + F5/F6) do not work anymore. I do not recall when this behavior started.

I have tried with kernel 6.10.8 but also with 6.9.10. It makes no difference.

Is someone experiencing the same behavior?

An adjustment via, e.g.

echo 50 | sudo tee /sys/class/backlight/amdgpu_bl1/brightness

works

Last edited by gaelic (2024-09-11 19:20:43)

gromit · 2024-09-06 11:43:30

Could you try the current linux-lts kernel which is from the 6.6 development cycle?

gaelic · 2024-09-06 20:14:03

I just rebooted to the lts kernel. Unfortunately the same behavior?

Is this maybe some BIOS bug? I do not have Windows installed to test. Maybe I will try a Live USB Stick with Fedora or something.

gromit · 2024-09-08 20:56:59

Is it also an issue with the latest release candidate for the mainline kernel?

sudo pacman -U https://pkgbuild.com/\~gromit/linux-bisection-kernels/linux-mainline-6.11rc6-1-x86_64.pkg.tar.zst

gaelic · 2024-09-09 16:17:14

No, unfortunately the mainline 6.11 kernel does not help. I assume it is not kernel related. Unfortunately I do not recall when exactly it stopped working. I am a bit baffled that a change via the terminal is possible without problems.

jl2 · 2024-09-09 19:20:46

Hi, do F5 and F6 work? You can use a tool like xev/wev to check.
If they do work, do fn + F5/F6 trigger a event on xev/wev?
if they work there, what DE/WM do you use?
If they don't work on xev/wev, it's probably be that the lenovo driver is to blame or your HW

gaelic · 2024-09-11 11:21:59

Hello.

I found the issue. I was using mutter-beta and have now upgraded to mutter-rc from gnome-unstable. So it really was a bug in gnome.

Thanks for the effort @all. I never thought that the "hardware buttons" would be so dependent on th eDE/WM.

g

jl2 · 2024-09-11 12:29:24

please mark the thread as solved by prepending a [SOLVED] (might have to shorten the title)

Arch Linux

#1 2024-09-06 11:26:54

[SOLVED] backlight Laptop buttons stopped working

#2 2024-09-06 11:43:30

Re: [SOLVED] backlight Laptop buttons stopped working

#3 2024-09-06 20:14:03

Re: [SOLVED] backlight Laptop buttons stopped working

#4 2024-09-08 20:56:59

Re: [SOLVED] backlight Laptop buttons stopped working

#5 2024-09-09 16:17:14

Re: [SOLVED] backlight Laptop buttons stopped working

#6 2024-09-09 19:20:46

Re: [SOLVED] backlight Laptop buttons stopped working

#7 2024-09-11 11:21:59

Re: [SOLVED] backlight Laptop buttons stopped working

#8 2024-09-11 12:29:24

Re: [SOLVED] backlight Laptop buttons stopped working

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