You need to make a stop into BIOS. Find the tab for North Bridge settings, force the IGD, and enable surround view.
And, there seems to be a lot of people saying to plug into the dedicated card, or else it won't be used. Plug into your motherboard's output using the APU. Using the APU (in my experience) has yielded better performance than using the dedicated output. Both cards are being used.
In my tests:
IGD output alone WEI = 6.7 for graphics and gaming graphics
6670 output alone WEI = 7.0 for graphics and gaming graphics
IGD + 6670 using IGD output WEI = 7.1 for graphics and gaming graphics
IGD + 6670 using 6670 output WEI = 7.1 for graphics and 7.0 for gaming graphics
Using a slew of games and open hardware monitor watching the core clocks and memory clocks of the R6670, I can see that even when gaming off the APU output, the clocks of the R6670 go up and the dedicated GPU is being used.
MSI R6670 1gb GDDR5
BioStar Hi-Fi A85W
4x4gb Gskill Ripjaw X
Cooler Master s524 HSF