First off, Newbies and Debian don't mix. You really, really, don't want to start off with Deb.
Second off, it's your XF86Config file for sure, could you post it for us? Shouldn't be all that much trouble.
I couldn't find anything about your model and linux with the exception of a Russian link
I did find all sorts of info on Vaios & linux, do any of these models share the same video card as yours? See if they have their XF86Config file posted so you can see what works for them.
http://www.google.com/linux?hl=en&lr...=Sony+Vaio+pcg