That's good news.
Now please try these while the image is open:
xrandr --output DVI-I-1 --set "dithering mode" "off"
or
xrandr --output DVI-I-1 --set "dithering mode" "static 2x2"
and change 'DVI-I-1' if you are using a different connector now.
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1819023
Title:
[nouveau] Scrolling screen flicker, especially on default Ubuntu lock
screen
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