Can't Set Brightness

[napcok]

Can you try to replace mate-power-manager with xfce4-power-manager?

Replace mate-power-manager with xfce4-power-manager

Seems like mate-power-manager does not work very well in Mabox. So, it will be replaced with xfce4-power-manager in future releases. If you like to switch to xfce4-power-manager now… 1. Remove mate-power-manager yay -R mate-power-manager # Also remove it from autostart: rm ~/.config/autostart/mate-power-manager.desktop 2. Install xfce4-power-manager yay -S xfce4-power-manager And to be able to disable/enable it with Mabox GUI autostart editor: cp /etc/xdg/autostart/xfce4-power-manager.des…

And see if that helps?

Otherwise, look at Backlight - ArchWiki