There isn't a problem, but if you try to monitor your GPU temperature, then it will always read -128°C. I think some mobile GPUs don't have temperature sensors, and yours could be one of them. I think that my 4870X2 always reads -128°C on the second chip.
What I meant by "The chip cannot work if it's -128°C," is that the minimum operating temperature of the GPU is above 0°C. It won't work below that temperature.
The rest of my post was actually the important information. I was just making sure you knew that the temperature sensor on your GPU was not working.
I don't think PowerXpress works with and Intel/ATI system. I know that I could never get it to work correctly with an ATI/ATI system (HD4200/HD5650M). It's been a year since I've used that laptop though since the screen died and the hinge broke.
Take a look at this Ubuntu forums post: http://ubuntuforums.org/showthread.php?t=1974521
You might try installing FGLRX directly from ATI, but be warned, I have broken my system doing it this way: http://wiki.cchtml.com/index.php/Ubuntu_Precise_Installation_Guide
You might take a look at this Ubuntu forums post: http://ubuntuforums.org/showthread.php?t=1974521
I wish you luck. I know exactly how frustrating this is.