Debian’s SiS drivers are by default out of date. The most current drivers can be obtained by adding a new source to /etc/apt/sources.list
deb http://www.winischhofer.net/sis/debian/unstable ./ deb-src http://www.winischhofer.net/sis/debian/unstable ./
apt-get install sisctrl x-driver-sis
After installing, make sure to use a SiS X11 configuration. See associated posting.
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