I edited /etc/gdm3/custom.conf and put WaylandEnable=false back in (I
had it enabled before to test). Greeter came right up on reboot and my
external monitor works again.
What is curious is that my session choice in both cases was/is Gnome on
Xorg. So is it possible there's some change in the greeter's behavior?
As to using wayland or not.
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