Thanks for the bug report. It sounds like GNOME (in the mutter component) has frozen. When this happens the cursor will still move because it is managed by the Xorg process, but the screen contents are managed by the gnome-shell process.
Please try removing DisplayLink from the equation by unplugging your dock or any other USB display adapter. Does the bug still occur using only the laptop screen? ** Tags added: displaylink evdi ** Package changed: xorg (Ubuntu) => mutter (Ubuntu) ** Changed in: mutter (Ubuntu) Status: New => Incomplete ** Summary changed: - Xorg freeze + Screen freeze -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1957181 Title: Screen freeze To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1957181/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs