Arch Linux

ollosh

Member

Registered: 2022-09-20

Posts: 51

[SOLVED] All of a sudden /sys/class/backlight has changed

Hi,

I went on a vacation for a month and natually upon my return wanted to update my system. Since there was a lot of updates I'm not sure what changed my backlight system, but for some reason it did change and now I'm unable to change brightness.
I'm using a custom script that is just changing the value under /sys/class/backlight/amdgpu_bl0/brightness. What I've noticed is that there is no more amdgpu_bl0, but only thinkpad_screen. What is even stranger is that I can't change the value in thinkpad_screen/brightness even as root

I'm on Thinkpad T14G3 AMD running 6.1.5-arch2-1

Any ideas what could be the problem?

Edit: just found out that this is duplicate https://bbs.archlinux.org/viewtopic.php?id=282755

Last edited by ollosh (2023-01-14 18:41:16)