Anyway the thing is that there's one, let's call it, "solution" which is VERY easy to use when you're a noob.
This solution goes like this:
Just add his PPA and install this driver, reboot, and you're done.
sudo add-apt-repository ppa:acasagrande/xf86-video-sismedia
sudo apt-get update
sudo apt-get install xserver-xorg-video-sismedia
Here's the link:
https://launchpad.net/~acasagrande/+arc ... o-sismedia
How cool is that?
I've done it and it just works (at least on Linux Mint 12), no need to sudo-edit anything. Oh please, stop asking for 3D support... there's not such a thing for SiS 671 / 771 in the Linux cosmos.
You should keep in touch with that thread, my suggestion.