MDM login screen and multiple monitors

[devosion]

When I boot up up with my dual monitor setup my login screen always appears in my second monitor, and not the primary monitor that I setup with the nvidia control panel, which always appears black. When I was using ubuntu lightdm had a nifty solution by activating both monitors and determining the orientation of the login screen by the location of the mouse. Is there a way I can set up something similar with the mdm login, or a way to have it only appear on a specific monitor? If so how do I go about doing that?