Same for me.
Ubuntu 20.04 nvidia-driver-390 (also tried 340.108), GeForce GT-750M
I noticed some weird behavior with the xrandr, note the "mm" size is
different for the same scale setting at different times.
greg@LapXPS:~$ xrandr --verbose --output eDP-1-1 --scale 2x2
screen 0: 6400x3600 846x475
I also see the fractional increments and can select any, but only the
100 & 200 work correctly, the others change something but it doesn't
scale properly.
Probably expected, I tried record the transitions using screen recorder,
it worked changing 200% to 100%, then when I select 125 the video gets
Same issue, downloaded & installed iso, fractional scaling was working,
it stopped working after an update, I also installed drivers for the
Wifi - Broadcom BCM4352
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