xbacklight is not working properly

Hi,

I’m using KDE but I’m trying to config also a i3 wm. However, I can’t change the xbacklight for the brightness control.

When I type in the terminal to set the brightness “xbacklight -set 20” (or something like) I receive this: “No outputs have backlight property”. Why?

Many thanks

See if this guide helps…
https://wiki.archlinux.org/index.php/backlight#xbacklight