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This is completely possible, but after the Wayland release of the X server became standard it is not easily done. At https://en.wikipedia.org/wiki/Wayland_(display_server_protocol) we see that "...The X Window System is an architecture that was designed at its core to run over a network. Wayland...

I had this problem with a couple of installations 3 or 4 years ago. What I found was that brightness was being set to 0 on the main display. Try increasing brightness, see what you can see.