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Detect correct resolution dual monitor VGA 9800gt Ubuntu 12.10

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http://askubuntu.com – I connected a second monitor to my 9800gt on the VGA port. The first monitor is on DVI. Both monitors have a native resolution of 1920x1080 but the second monitor doesn't get past 1360x768 and appears as "Unknown" in the display settings. I tried this guide on how to add undetected resolutions but it didn't work. First I create the new mode with xrand --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync and then when I try to add the new mode to my second monitor like randr --addmode VGA-0 1920x1080 I get this error: X Error of failed request: BadMat (HowTos)