I can see a couple of pixel-layout-related settings here:
dithering depth: auto
supported: auto, 6 bpc, 8 bpc
dithering mode: auto
supported: auto, off, static 2x2, dynamic 2x2, temporal
The nouveau kernel driver provides them regardless of the attached
monitor. You can tweak them with:
xrandr --output DP-1 --set <property> <value>
or similar. Though that might not help...
What might help is installing the proprietary Nvidia driver instead.
Have a look in:
Software & Updates > Additional Drivers
to install the Nvidia driver.
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https://bugs.launchpad.net/bugs/1852166
Title:
[nouveau] Pixel pattern error at 120Hz or 144Hz, but 60Hz works
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