According to JournalErrors.txt you're using the nouveau X driver. So reassigning...
** Package changed: xorg (Ubuntu) => xserver-xorg-video-nouveau (Ubuntu) ** Tags added: nouveau -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1774265 Title: Heavy flicker/flashing on external monitors using resolutions higher than 1920x1080 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1774265/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
