The S3's "Savage" family is indeed a different driver, I have a system with a 32MB PCI Savage4 card.
Getting mode-setting to work requires the UseBIOS option to be disabled, this will allow the card to set a mode as indicated by DDC/EDID information from your monitor.
So, generate an xorg.conf file using Xorg -configure, copy said file to /etc/{X11,}/xorg.conf and add Option "UseBIOS" "false" to the Device section.
Good luck.
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