• https://linuxhint.com/display_brightness_commandline/

How to adjust screen brightness via shell:

brightnessctl -l # use this to find out the device identifier
brightnessctl -d “intel_backlight” set 100%

vim ~/.bashrc

function screenbrightness() {
    
    BRIGHTNESSLVL="${1}%"
    brightnessctl -d "intel_backlight" set "${BRIGHTNESSLVL}"

}