The driver you want is already included, you might want to do something like as root from runlevel 3;
cp /etc/X11/xorg.conf /etc/X11/MyBackup_xorg.conf
system-config-display --reconfig --set-driver=i810_drv
In addition you might want to add the 915resolution rpm package from RPMforge;
http://dag.wieers.com/rpm/packages/915resolution/
