Arch Linux

lucasyata

Member

From: uruguay

Registered: 2021-12-01

Posts: 27

changing acpi's brightness value doesn't actually affects brightness

Hello

So, echo a value to /sys/class/backlight/intel_backlight/brightness doesn't actually affect the brightness.

When i just installed arch it didn't work automatically, so i followed the page. I tried the following kernel command line options:

acpi_backlight=none
acpi_backlight=video
acpi_backlight=native
acpi_backlight=vendor

Nor of them worked.
PD: i typed LITERALLY that into the kernel command line.

Light package doesn't neither but it's exist status is 0.
Xrand doesn't neither.

The acpi createdd is intel_backlight(/sys/class/backlight/intel_backlight)
I run an integrated gpu Intel® HD Graphics 500 into Intel(R) Celeron(R) CPU N3350 @ 1.10GHz
As you may suppose i run arch on a laptop.
My actual boot entry:

title Arch Linux
linux /vmlinuz-linux
initrd /intel-ucode.img
initrd /initramfs-linux.img
options root="LABEL=Arch-root" acpi_backlight=vendor

I read https://wiki.archlinux.org/title/Backlight session about: acpi, kernel command line options and troubleshooting.

In ubuntu it works fine, so i'm sure that there should be some way to make it work on arch too.