Ubuntu 5.04 autodetects this card and assigns the vesa driver. However, there is an SiS option which loads the vesa driver. There is an SiS option also.
Driver "sis" ... in xorg.xonf - which will provide 2D acceleration. There is no DRI support for this chipset - though there are SiS cards with DRI.
Reference: 
http://www.winischhofer.eu/linuxsisvga.shtml
No page links to 6330.
