One more test and one more problem:
Tested plugging in an external monitor. This was not very good. First, it was very
difficult to find a cursor so I could do anything. The laptop screen got rescaled and
looked awful. Switching to external monitor only was fine. Unplugging external monitor
left laptop screen scaled badly. Manually switching the scaling back to 100% fixed it (it
had changed to 125% supposedly, although it looked to be scaled more like 3x).