When I said cards, I meant chips. Small oversight. Why are you focusing on that anyways, not like that's the kicker here...
Now according to your latest post, you're clearly as clueless as I thought. For a very few of their later cards...? Yea, except they have drivers for every single mobile chip and card they put out...great analysis.
Either you're stuck in some old ways, or you're just really ignorant. Of the 50 or so laptops I've worked on (sure, it's not many), with a wide range of nvidia and ati GPU's, not a single one has had any sort of video driver issues. They were all loaded with drivers straight from those sites. There's no reason for them not to work, and you can't seem to actually prove this, so I'm sticking to my advice.
sundaresan: You can get the drivers from either nVidia's or Sony's site. It doesn't matter which you choose, they'll both work as long as you choose the right one for your OS and your GPU.