Question

4

Can't change brightness on version 22.04

rated 0 times [ 4] [ 0] / answers: 1 / hits: 9619 / 2 Years ago, wed, december 29, 2021, 1:59:31

I'm new to Linux, so I use Linux on dualboot. At the first time of installing Ubuntu, the brightness slider was working fine but when I made some updates + installed an Nvidia driver the slider is not doing anything anymore. Tried adding GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor to /etc/default/grub but didn't work. Tried to install Brightness Control as a temporary solution but even that wasn't working.
The /sys/class/backlight folder has two folder in it; amdgpu_bl0 and ideapad, brightness slider only effect the files included in ideapad folder. What should I do?
System specs:
Ryzen 5 4600H
GTX 1650 Ti

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answered 2 Years ago smelrop · Accepted Answer

Thanks to this post, I am able to change the screen brightness.
Go to /etc/grub and find GRUB_CMDLINE_LINUX= and add amdgpu.backlight=0 to there. Solved my issue in Fedora and Kubuntu both so the problem is the Radeon Graphics iGPU I guess.