Hi Bronsi, and welcome to "the friendliest board this side of Reidquat!!"™
Mobility Radeon graphics in laptops can be a thorny problem, for sure.. I'm having a battle with a Mobility Radeon X2300 in an Asus laptop at the moment.. it is utterly unsupported by AMD (or anyone else except Asus) for any platform.
The problem seems to be that most laptop manufacturers don't cooperate with AMD and use custom versions of graphic chips, forcing their customers to make do with whatever the manufacturer can be bothered to release. I'm on the verge of modifying the BIOS in my X2300 to see if I can get it to work under Linux that way.
Fortunately your X700 is well supported, however.. if you go to the AMD support site
you should be able to get the latest drivers installed. It may well make all the difference.