Brightness works on live CD but not on installed, MBP 10,1

General system Kernel, boot, graphics & hardware
2

@meky
I tested with Fn+F11/F12 in live EOS-Gemini - it does nothing.
yay -S brightnessctl
brightnessctl s 10%-
brightnessctl s 10%+
See how to assign to keys

or write two scripts as an example bridn.sh /briup.sh

#!/bin/bash
brightnessctl s 10%-

(chmod +x bridn.sh is needed) and assign to shortcuts