His laptop has a low end APU in it (AMD A6), 6520 integrated and I'm guessing a discrete 6650m card, but that may be entirely false.
Usually, laptop companies ship it out with drivers that automatically manage the "crossfire" (it's not really crossfire but it works similarly to it) so that both the integrated and dedicated chips work together.
The drivers that the vendor shipped your laptop with will be the only ones that work correctly and if you switch to ones provided by AMD, you run the risk of a bluescreen.
Now, assuming that you do in fact have a discrete card, the fact that both are running should have nothing to do with it.
If your laptop vendor included AMD catalyst, you're in luck. Right click your destop and click the text with the red icon next to it. You should be able to disable the crossfire and have it work. You'll get lesser performance.