Comment 3 for bug 1082952

The same happens with the gtk greeter.

The problem here is, that lightdm/xorg mirrors the display per default (at least with intel drivers, not with nvidia tho), so on both monitors i see the lightdm login screen and with one monitor being lower resolution, the second monitor gets the lower resolution aswell, otherwise its not possible to mirror.
If the 2 Monitors would be the same resolution, it would be fine.

Console gets mirrored on both screens aswell with the bigger screen not utilized fully.