The XFree/XOrg extension to allow on-the-fly change of resolution, bit depth, or frequency, is called "randr" or "xrandr" (I don't remember).
IIRC (which means: If I remember correctly), the KDE project created a nice GUI (graphical user interface, ie: using windows) program for controling this randr extension. And IIRC this program is called krandr. But I don't use KDE, so I can't confirm.
Yves.
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