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Got a new laptop (Samsung Galaxy Book Pro 360) and i'm having issues with the display brightness not working. I've tried using software to control it as well as using the brightness control on the keyboard and nothing seems to work.

i tried adding GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" to my grub file and updating grub then rebooting, did not work.

also tried doing that and creating a 80-backlight.conf file and putting it in usr/share/X11/xorg.conf.d and still nothing.

i have also noticed that inside of the usr/share/X11/xorg.conf.d there are files named 10-amdgpu.conf and 10-radeon.conf which is strange considering this is an intel laptop and should be using intel intergrated graphics not anything amd.

also, just to point out, screen dimming works in the case of the laptop being idle for a certain amount of time, just cannot be controlled manually via software or keyboard controls.

any help would be appreciated.

aaron roussel
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3 Answers3

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I also had the same problem. My laptop is Samsung Galaxy Book2 pro. I added GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" to my grub file, however it didn't work.

Thus, I tried the method introduced in https://wiki.archlinux.org/title/Backlight#OLED_screen_brightness.

What I have done is writing a new file named backlight.rules in the folder /etc/udev/rules.d, and the file contains the following udev rule:

RUN+="/bin/chgrp video /sys/class/backlight/intel_backlight/brightness"
RUN+="/bin/chmod g+w /sys/class/backlight/intel_backlight/brightness"

Then, the brightness control in upper left of the desktop works.

Pilot6
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Sunggon Kim
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https://github.com/F-i-f/soft-brightness seems to be the only solution that works for (AM)OLED screens running on Wayland with Intel processor.

After installing soft-brightness, brightness gets adjusted via both Ubuntu control and keyboard.

Vinod Singh
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if anyone stumbles upon this thread;

i fixed the issue by updating kernel version to 5.14. i was previously using version 5.10 or 5.11. Editing the grub file might also be needed, not sure as i had already edited the file and i do not know if the file is overwritten/replaced when updated to a newer kernel version.

aaron roussel
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