add display resolution ― what is wrong of this xorg.conf

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http://askubuntu.com – I have an TV screen which I would like to attach to my laptop with the right resolution. Just because this is basic stuff I searched and found a lot about the xorg.conf file, modelines and so on. My Screen has a resolution of 1920 to 1080 pixels and I created this xorg.conf But in the nvidia settings no trace of this resolution appears. What is wrong about this? Any Ideas? (HowTos)