Still some work to do, but much better now.
In the sterr output when run as a new user where both screens are used,
I saw
Checking screens: available: (QScreen(0x55723012fa90,
name="DVI-I-1"), QScreen(0x55723011a010, name="DVI-I-2")) redundant:
QHash() fake: QSet() all: (QScreen(0x55723012fa90, name="DVI-I-1"),
QScreen(0x55723011a010, name="DVI-I-2"))
but run as my regular user, where wayland only finds one screen, I saw
Checking screens: available: (QScreen(0x55ff257aaaf0,
name="DVI-I-2")) redundant: QHash() fake: QSet() all:
(QScreen(0x55ff257aaaf0, name="DVI-I-2"))
After flailing about trying to figure out why one of the monitors
didn't seem to be available, I found kscreen-doctor and I realized that
I COULD select the "missing" monitor in the Display Settings and enable
it. I'm still having problems getting that change and the relative
positioning of the two monitors to stick across sessions, but at least
I've now got stuff to work with.
Thanks for the pointers.
