Task: Turn off laptop integrated display with external monitor connected and laptop lid up.
Gnome:
osx:
https://alinpanaitiu.com/blog/turn-off-macbook-display-clamshell/
Reverse engineering the MacBook clamshell mode
Closing the MacBook lid with an external monitor connected can turn off and disable the internal display. Let's figure out how macOS does that and bypass the lid sensors.alinpanaitiu.com