Same issue with Xubuntu 18.10 Cosmic and nvidia-driver-415. As mentioned above it is not only the lock screen, but the boot splash screens as well.
** Tags added: cosmic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1760068 Title: Wrong resolution at unlock screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/light-locker/+bug/1760068/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
