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I tried everything I found online, but none of the methods I found worked. The buttons don't work, and there's no such thing as Brightness in Monitor Settings. I tried 

xbacklight -set

but it didn't do anything. (Theoretically it should have worked, I have everything installed and it actually ran, but no effect was shown.) I also tried 

xrandr --output VG1 --brightness

but it had some error.

My eyes are pleading for help :3

Zanna
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equula
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1 Answers1

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Everything in Linux is a file. There is a device file to change the brightness.

Open terminal using Ctrl+Alt+T.

Execute this command: cd /sys/class/backlight/ . Under this directory you'll find a dir named acpi_video0, you might get it with different name.

enter image description here

CD to that directory. cd acpi_video0 and open the file brightness using root user.

enter image description here

You can write a command or a keyboard shortcut that does the modification of the file for you. It's up to you how you want it!

manishrw
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  • Thank you very much!

    I eventually tried this: http://askubuntu.com/questions/332657/cannot-change-brightness-setting-using-function-buttons-or-using-the-brightness and it worked :)

     – equula Dec 01 '15 at 18:35