One of my two ~10 year old 23" 1080p main displays died recently. So I finally upgraded to two used 27" 1440p displays. These are now the first displays on my desktop that allow adjustments of the backlight from software. So I tried to find out how to go about that. Turns out on laptops both the display backlight intensity and the ambient light sensors are controlled via ACPI, with proper kernel support already available (see eg. the Arch Wiki). But on desktops no standard for ambient light s...
