Problem with dual-view

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http://askubuntu.com – I've just installed 12.04 LTS on my old IBM ThinkPad R51 and I connected Samsung Syncmaster 21.5" monitor via VGA port. I've tried to do dual-view, but when I try to set a resolution on a monitor, which is bigger then laptop's resolution, I got an error: The selected configuration for displays could not be applied. Requested position/size for CRTC 63 is outside the allowed limit: position=(1024, 0), size=(1920, 1080), maximum=(2048, 2048). When I try to launch nvidia-settings, it says: You do not appear to be using the nvidia x server. I've tried to install newest Nvidia drivers et (HowTos)