I'm trying to use an auxiliary LCD as a light-pad/bed/table by loading up a 1080p white .PNG in preview and setting fullscreen ON.
The problem is after several (20?) minutes of inactivity I get the Apple screensaver kicking in, and then have to enter my password.
How to prevent this?
Nothing in System Prefs -> Energy Saver works.
pmset noidle but that's also fails.