I have coded a program to display a countdown using PySimpleGUI. I want to run it on one HDMI output of the Pi4. The other HDMI output should continue to run a regular frame buffer as I’d like to use PiDeck on it (which uses OMXPlayer).
My X knowledge is quite dated and what ever search term I come up with describes how to use both screens with Xorg. https://tldp.org/HOWTO/html_single/Framebuffer-HOWTO/#AEN1010 Is the closest I could find but is totally outdated.