I recently upgraded my dead GPU to a brand new nvidia gtx 1060, the swap-over wasn't as smooth as i hoped, anyway only some solid colors in random areas are not displaying correctly, especially noticeable on the purple login screen and my black background (built in solid color). all my drivers are up to date and all AMD drivers removed, screenshot shows the difference in blacks between wallpaper and terminal (ubuntu 18.04) tia screenshot
41 Answer
"In the Gnome Tweak tool under appearance you can set the adjustment for background and lock screen as 'None'. This fixed the problem for me."- John Cullen's answer to a different issue worked for this also
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