Daniel:

Thanks for linking to https://bugs.launchpad.net/bugs/2060268.  Solved
my "ghost monitor" problem; I will report my experience on that bug.

Relative to the screen resolution - when I added the boot flag mentioned
there to /etc/default/grub, rebooted and logged into an X (not Wayland)
session, my screen was back to 3840 x 1080.  However, when I went into
Settings and changed the resolution to 5120 X 1440, this time the screen
blanked briefly, then returned in the higher resolution and asked if I
wanted to keep the setting.  I selected "yes" and I continue to have the
desired resolution as long I as I am using X.

However, logging into a Wayland session, my screen resolution is back to
3840 X 1080, and I still cannot run the Settings to try to change the
resolution (the Settings icon appears briefly in the dock, then
vanishes, and no apport is offered).

Another observation: looking at the GNOME login screen, I'm pretty sure
it's in 3840 X 1080 mode as well (or at least, not in the higher
resolution supported by this monitor), as the info on the screen appears
larger than I recall it from April in 23.10.

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https://bugs.launchpad.net/bugs/2065791

Title:
  incorrect screen resolution in wayland session

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