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#1 2021-10-13 20:03:19

Registered: 2021-10-13
Posts: 4

[SOLVED] Issues with backlight on Legion Lenovo 5 15ARH05

As title suggests,
I'm having issues controlling my brightness. I think it's a x11 xorg config issue. Ive had issues with all Linux Distros.

I get the acpi_video0 error message during boot up.

I added in the /etc/default/grub file
GRUB_CMDLINE_LINUX_DEFAULT=acpi_os=linux acpi_backlight=native

then I ran the grub-mkconfig -o /boot/grub/grub.cfg command, returns with no errors.

The boot error is gone, but I still don't have backlight control.

I tried editing the /sys/class/backlight/amdgpu_bl0/brightness file, but it doesn't seem to do anything.

Found this post:

Which touches on the topic, and I tried adding the x11 config file, but Linux boots to a black screen. I try manually restarting lightdm, but to no avail (sudo systemctl restart lightdm)

I noticed, some people resolved the issue by booting with discrete graphics instead of switchable.

I tried that, and the brightness gui didn't even pop up when trying keyboard shortcuts.

I checked my /sys/class/backlight dir, and noticed that there weren't any symlinks like before.

Anyways, I'm kinda stuck now. Been working at it for a couple days.

Last edited by Vitadek (2021-10-14 04:31:17)


#2 2021-10-14 04:30:53

Registered: 2021-10-13
Posts: 4

Re: [SOLVED] Issues with backlight on Legion Lenovo 5 15ARH05

When using switchable graphics setting on my bios.

adding amdgpu.backlight=0 to my /etc/default/grub file works. Gonna put this as solved.


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