You'll have to modify your X config file. If you run xorg-x11, then open up xorg-x11.conf (where it is varies by distro but check /etc/X11).
Make your way down to
Section "Screen". You should have a variety of different choices configured. It should look something like:
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Source code
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## Screen sections
Section "Screen"
Identifier "Main Screen"
Device "NVIDIA"
Monitor "Samsung"
DefaultDepth 24
Subsection "Display"
Depth 24
Modes "1280x1024" "1024x768"
ViewPort 0 0
EndSubsection
EndSection
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The directive "Modes" can have different resolutions, separated by a single space, depending on what your monitor supports. After you make these changes, restart X, log back into KDE and you should have new choices in Peripherals --> Display.