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I want to change the display's frequency from 60hz to 50hz, on a fedora core 9 box, anyone know how to do this?

Thank you

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What desktop environment? –  Let_Me_Be Nov 2 '10 at 15:58
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2 Answers

Expand the Monitor section of /etc/X11/xorg.conf to look something like this:

Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "Monitor Vendor"
        ModelName    "Monitor Model"
        HorizSync    30-107
        VertRefresh  48-120
EndSection
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Add a new modeline to the Monitor section of /etc/X11/xorg.conf with the desired frequency. Use cvt to generate the appropriate modeline.

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