This sounds most likely related to temporal dithering (FRC) on the LCD screen.
Are you able to provide a video of the problem? ** Package changed: xorg (Ubuntu) => ubuntu ** Changed in: ubuntu Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1825709 Title: flickering graphic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1825709/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp