Login Screen Resolution is wrong (Ubuntu 12.04)

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http://ubuntuforums.org – So I upgraded to Ubuntu 12.04, and the screen resolution on the login screen is off. It is way to big for my monitor. I have a 21 inch monitor. The resolution is at 1600 by 1200 or whatever it is. It's to big, haha. How do I turn down the resolution for the login window? Thanks for the help. (Hardware)