also have a similar problem with xubuntu & ubuntu studio (with updated &/or 
fresh install, but not with test version), the screen is "broke" in different 
displaced strips.
I fixed it (temporarily) increasing the framebuffer in 1 pixel
eg: xrandr --fb 1441x900 --output DisplayPort-0 --mode 1440x900 --panning 1440x0

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https://bugs.launchpad.net/bugs/1876384

Title:
  Gnome 3.36 flickering framebuffer line above status bar

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