Increasing Nvidia screen resolution, revisited

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http://forums.fedoraforum.org – I have a new monitor (to me) and I am trying to increase the screen resolution. I have tried everything I have found in the forum with no luck. The system is F17, kernel 3.5.2-3.fc17 x86_64, with Kmod Nvidia to match, and KDE 4.8 or whatever installs with F17. The maximum resolution the system will allow me is 1024x768 and I am trying to get to 1920x1080. The video card is Nvidia 6100 and works at 1920x1080 in Windows 8 RC, and also Windows XP. I have tried xrandr setup, addmode, etc., with the message "not allowed" in each case. The KDE display setup GUI and the Nvidia setup GUI uti (HowTos)