Workaround i found in -> https://bugs.launchpad.net/ubuntu/+source
/unity-greeter/+bug/1082952/comments/6

1)        log in
2)        use xrandr or the Displays control utility to configure your monitors 
how you'd like them to be configured in the login screen
3)        copy ~/.config/monitors.xml to /var/lib/lightdm/.config

If resolution alway resets after reboot try to do in Gnome 3  
 Settings -> Displays -> Arrange Combined Displays      ( the same as Step 2)

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https://bugs.launchpad.net/bugs/874241

Title:
  Wrong resolutions in lightdm login screen when using external monitor
  connected to laptop

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