While I probably cant help with your actual problem... I have been seeing a number of similar issues recently. All involving laptops with the 'new' intel hd graphics and a dedicated graphics card.
These units look nice in the reviews - they are supposed to use the intel graphics for desktop and the dedicated card for gaming/3-d type stuff - it's a nice way to save power, at least on paper.
My guess is that they are failing at autocad because they don't know which card to assign to the task. Check around the forums, the problem is likley not the radeon video card itself.
