Why can I not change the resolution of my MGA 200SE graphics card using system-config-display?

Updated -

If screen resolution is changed with system-config-display (from 1024x768 to 800x600, say), and X restarted, the resolution isn't changed.

The reason for this, is that /etc/X11/xorg.conf contains a 24bpp section only.

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "Monitor0"
        DefaultDepth     24
       ...

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