Read the statement by Michael Teeuw here.
MagicMirror on second Monitor
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@sdetweil With the displays showing “HDMI-A-1” etc, it’s in Wayland, xrandr doesn’t function under that. This is part of why I suggested going back to X11.
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@BKeyport xrandr --query worked while running wayland, output above
wlr-randr does not do --query
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@sdetweil Ahh, ok, I thought it was completely dead. Good to know.
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You are absolutely brilliant, now it works.
I change in “raspi-config” to x11 desktop environment and now magicmirror run on second monitor.Thank you all for your tips
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@BKeyport I believe you are right. I had the same issue. I tried to run the xrandr query and I could not print the displays. I looked everywhere, the only solution I found was to switch back to X11. This was the only way to get the electron option to treat the screen as a single screen and move the display to the second monitor.
Anyway, thanks a lot, reading this post solved my problem and I was trying to figure it out for a while !