I think this is fixed in Ubuntu 13.10. For me both screens are set to their native resolution at the login screen and in the guest session.
-- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-settings-daemon in Ubuntu. https://bugs.launchpad.net/bugs/874241 Title: Wrong resolutions in lightdm login screen when using external monitor connected to laptop To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm-guest-session/+bug/874241/+subscriptions -- desktop-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
