Your Xorg logs are showing:
[ 4864.686] (WW) modeset(0): hotplug event: connector 93's link-state
is BAD, tried resetting the current mode. You may be leftwith a black
screen if this fails...
where connector 93 is the DisplayPort. Please try a different monitor
cable, or just replugging it.
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1853221
Title:
Two monitors displaying same image
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