Brightness will not change

[snurglez]

So Endevour wont let me change my brightness on my screen, not even the system settings or my keys (F5 and F6) will work, I am running a thinkpad e15 laptop with a Ryzen 5 5500u on radeon graphics Kernel: 6.1.4-arch1-1
Plasma 5.26.5

[pebcak]

Have a look at this thread and see if the solution will work for you as well:

6.1.4 Kernel and Screen brightness problem

Hi, First of all I’m Linux newbie so excuse me for any mistake or dumb question I may make. Question: Does anyone have problems with maxed out screen brightness (on laptop) since 6.1.4 update? Explanation: Since update to 6.1.4, my brightness slider has disappeared from the power manager applet and “/sys/class/backlight/” is empty. Downgrading to 6.1.3 returned brightness slider and “/sys/class/backlight/” now has “intel_backlight” folder (as it should). Problem was noticed on HP EliteBoo…

[snurglez]

I’ve tried this solution and it doesn’t seem to be working for me, setting it to one of the 4 options does nothing

[petsam]

@snurglez

I am running a thinkpad e15 laptop

I am not a Lenovo employee, but… have you read the manual yet?
Try using those buttons while holding Shift.
There is a BIOS option to invert this behavior.
IIRC some DE’s extension can change those on-the-fly (GNOME? )
Also AUR packages for thinkpads do such things.

[Stefax2001]

@snurglez

I’ve tried this solution and it doesn’t seem to be working for me, setting it to one of the 4 options does nothing

Did you update your grub.cfg with "update-grub" or "grub-mkconfig -o /boot/grub/grub.cfg" after changing kernel boot parameters?

@petsam

Try using those buttons while holding Shift.

I’m pretty sure it’s FN not Shift (at least it was FN on every laptop I had a chance to work on).

[snurglez]

it keeps saying command not found

[ricklinux]

Did you install with systemd-boot or grub?

Edit: If the install is with grub you can add a kernel parameter to the default grub command line in

/etc/default/grub

acpi_backlight=video
acpi_backlight=vendor
acpi_backlight=native

I would recommend acpi_backlight=vendor or acpi_backlight=native but you can try them all and see. Try them separately and update grub and reboot.

Try each one of these separately and see which one works. You have to add it and then update grub with

sudo grub-mkconfig -o /boot/grub/grub.cfg

Then reboot

Edit2: If your install is systemd-boot then the parameter is added here

/etc/kernel/cmdline

Then run

sudo reinstall-kernels

reboot.

[snurglez]

OK I am an idiot, I did a fresh install with grub, and did everything you guys said using native settings, and it works now, thank you!