Score:0

How to fix brightness keys not working in Ubuntu 20.04 LTS

cn flag

I recently ran into a problem regarding my brightness control on my Lenovo Ideapad S145. The brightness keys are not working, and the slider in the top right corner is not working either.

A couple things worth mentioning:

I already tried the fixes where you edit the grub file. None of them worked. The brightness control works on the login screen, but doesn't work when I actually log in.

My computer has AMD® A6-9225 radeon r4, 5 compute cores 2c+3g × 2 for the CPU, and AMD® Stoney for the Graphics, so I couldn't do the fixes where I add a conf file as most of the fixes I came across only showed me how to do it for Nvidia and Intel. I have AMD.

I am on Ubuntu 20.04.3 LTS.

I am very certain that this is a software issue.

Will avatar
id flag
The only simple thing I can think of that might help is that the brightness on a laptop is usually one of the function keys (for my Asus it's f5 & f6 to adjust brightness). Sometimes (and it's something you can adjust), you just hit that key, and sometimes you need to hold Fn whilst pressing the key - it depends on how the laptop is set up. It may well not be that simple, but give it a go and I hope it works!
Matias N Goldberg avatar
vg flag
Were you able to fix this issue? If not, can you post the output of `ls /sys/class/backlight/` ?
Score:0
cn flag

***Hi Run below command:

sudo gedit /etc/default/grub

change following parameter in grub file -> GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=native"

Save the file and run below commands:

sudo update-grub

reboot

Enjoy :)


jnunes avatar
pa flag
I took your steps but unfortunately it didn't work. Do you know how it might have failed? Thank you
Alex Bondarev avatar
pt flag
My comp is Lenovo and I use Ubuntu and the light button is not work. I try to do change the line as you is writing here but the button is not work.
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