Thank you for your investigation and workaround! I'll see if I can
disable the iGPU.
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Desktop Bugs, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/2017323
Title:
Xorg multi-monitor setup
If the BIOS allows you to switch to discrete graphics only (use dGPU for
everything and disable the iGPU) then you would be able to use the
Nvidia driver for all displays and that would avoid the bug.
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You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is
mutter = Invalid because there's nothing mutter or gnome-shell is doing
to cause this.
xorg-server = Won't Fix because it's legacy software and is never going
to be redesigned to avoid this limitation.
linux (kernel) = Opinion because it is the source of the 16384
limitation but that might be a