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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 https://tldp.org/HOWTO/html_single/Framebuffer-HOWTO/#AEN1010 Is the closest I could find but is totally outdated.

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Allocate two framebuffers from config.txt

max_framebuffers=2

Tell Xorg to use only one screen: create xorg.conf with sudo xorg -configure and edit it to keep only the first device. If Xorg is not using the second screen anyway, skip this step.

Run omxplayer on the second screen with --display 7 as described here.

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  • running ˋXorg -configureˋ yields in an error. No devices are found. I tried creating an ˋxorg.confˋ by hand with no success. Do you have any hints on how to get started or what are the relevant sections?
    – Jonathan
    Nov 19 '20 at 4:03

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