Arch Linux

arupy

Member

Registered: 2021-05-26

Posts: 6

Lenovo IdeaPad 5 (15ARE05) - Brightness not working w/ Ryzen CPU

System
Lenovo IdeaPad 5 1(5ARE05) w/ AMD Ryzen 4500U.

Issue
I installed Arch Linux yesterday and I'm having difficulties getting the brightness to work on my laptop. Neither the hardware buttons nor tools such as xbacklight seem to work, and the brightness is at 100% so it feels like I am staring into a lightbox. It is painful typing this. The brightness DOES work very rarely, approximately one out of ten boots, but I don't why this is happening. I had experienced a similar issue with my prior Ubuntu install, but do not recall how I had fixed it. I'm using the latest Linux kernel (12.x) and have updated my BIOS.

Here are related links with the same issue:
https://bugs.launchpad.net/ubuntu/+sour … ug/1881462
https://askubuntu.com/questions/1249152 … ot-working

Here is the output from systemctl status:

x systemd-backlight@backlight:acpi_video0.service - Load/Save Screen Backlight Brightness of backlight:acpi_video0
     Loaded: loaded (/usr/lib/systemd/system/systemd-backlight@.service; static)
     Active: failed (Result: exit-code) since Wed 2021-05-26 13:25:33 EDT; 37s ago
       Docs: man:systemd-backlight@.service(8)
    Process: 567 ExecStart=/usr/lib/systemd/systemd-backlight load backlight:acpi_video0 (code=exited, status=1/FAILURE)
   Main PID: 567 (code=exited, status=1/FAILURE)
        CPU: 2ms

May 26 13:25:33 ARUARCH systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:acpi_video0...
May 26 13:25:33 ARUARCH systemd-backlight[567]: Failed to get backlight or LED device 'backlight:acpi_video0': No such device
May 26 13:25:33 ARUARCH systemd[1]: systemd-backlight@backlight:acpi_video0.service: Main process exited, code=exited, status=1/FAILURE
May 26 13:25:33 ARUARCH systemd[1]: systemd-backlight@backlight:acpi_video0.service: Failed with result 'exit-code'.
May 26 13:25:33 ARUARCH systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:acpi_video0.

Last edited by arupy (2021-05-26 18:44:57)

arupy

Member

Registered: 2021-05-26

Posts: 6

Re: Lenovo IdeaPad 5 (15ARE05) - Brightness not working w/ Ryzen CPU

I resolved this issue by adding this to my grub configuration.

GRUB_CMDLINE_LINUX="acpi_backlight=video"

Wolfattackx

Member

Registered: 2018-02-06

Posts: 14

Re: Lenovo IdeaPad 5 (15ARE05) - Brightness not working w/ Ryzen CPU

I also had this problem. I initially solved it by adding

acpi-backlight=none amdgpu.backlight=0

to the kernel parameters. But recently I removed these parameters but the backlight still works. Hope this helps.