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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