Comment 5 for bug 118325

Steps to patch and rebuild:

Download the patch as plain text from http://gitweb.freedesktop.org/?p=xorg/driver/xf86-video-sis.git;a=commitdiff_plain;h=391dad44fa305be4cded31cf2f9a4fba7420af99;hp=89d2f2118a2409d1bf0239448a4e3d2f6e7a1919

sudo apt-get install devscripts
sudo apt-get build-dep xserver-xorg-video-sis
apt-get source xserver-xorg-video-sis
cd xserver-xorg-video-sis-0.9.3
patch -p1 < the_patch_that_you_downloaded
debuild -b -us -uc
cd ..
sudo dpkg -i xserver-xorg-video-sis*.deb