This repository contains a GUI utility for the brightness control on secondary screens ("ScreenPad Plus") on ASUS Zenbook Duo notebooks. This also includes the asus-wmi kernel module.
$ sudo chmod a+w '/sys/class/leds/asus::screenpad/brightness'
chmod: cannot access '/sys/class/leds/asus::screenpad/brightness': No such file or directory
And 1 here (after 1 month nothing)
And the 7th one is that you only give manual for Debian-based users