If you use a driver you will have some artifacts. There will be an after image of the cursor, but other than that your graphics will work like they are supposed to. This kext should work for you: http://www.osx86.net...950_+_lion.html
Using DSDT is a better option. There will be no video artifacts. I have had problems extracting the original DSDT file in 10.6.8, so if you just want to use my DSDT file it should work just fine. Extract the dsdt.aml file then open your hard drive's root directory and drag the dsdt.aml file into the Extra folder.
- dsdt.aml.zip 6.48K
Many thanks, but I've copied your unzipped dsdt.aml file in to the Extra folder, but when I then go to Display properties, I still only have 1024x768 available