Comment # 21 on bug 103791 from Michel Dänzer

(In reply to Anthony Parsons from comment #18)
> Running xrandr doesn't seem to work as a workaround but flipping VTs does.

Have you tried turning it off and on again? (Who gets the reference? :)

xrandr --output DisplayPort-0 --set TearFree off
xrandr --output DisplayPort-0 --set TearFree on