See the fd.o bug, but this xrandr configuration seems to behave
normally:
xrandr --fb $((1920 * 3))x1080 --dpi 100 \
--output eDP-1 --mode 1920x1080 \
--output DP-2-8 --auto --left-of eDP-1 \
--output DP-2-1 --auto --left-of DP-2-8
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https://bugs.launchpad.net/bugs/1898210
Title:
X11 applications do not refresh in a timely fashion, resulting in
screen corruption, when using custom xrandr scaling
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