I was having this same issue after plugging in my screen. Oddly enough this issue was resolved when I was trying to solve another issue about screen locking up when opening a new application.
Here is the solution that fixed both issues. https://support.displaylink.com/knowledgebase/articles/1843660-screen- freezes-after-opening-an-application-only -- 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/1278223 Title: Mouse Flickering after adding 3rd Monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1278223/+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
