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How can I set the location for the login screen with lightdm in a multi monitor setup.

If have two monitors (1920x1080) + (1920x1200) and currently after I boot the login is shown on the left (smaller) monitor. I would like to view it only on the right (bigger) monitor.

Switching the cables on the graphics card did not help, and I have already made the bigger screen my primary screen using xrandr:

xrandr --output DVI-1 --primary #big screen

After login my panel is on the primary screen but the login screen itself is shown on the other smaller screen. How can I configure lightdm to display the login only on the bigger screen.

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