Garbaged display at logon with dual monitors

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http://ubuntuforums.org – Running Nouveau driver on an nVidia GTS250 dual head card with 2560x1600 primary and 1920x1080 secondary displays connected. The login screen gets mirrored on both monitors at the lower of the two resolutions. The display gets completely garbaged for about ten seconds after entering my password - looking like an unsorted Rubik's cube with chopped up pieces of the login desktop scattered across the screens, before the unmirrored desktop appears correctly across both displays. Is there any way with the Nouveau driver to not have the login screen mirrored across both displays? I don't want to (Hardware)