Dual GPU

I have an HP Pavilion 15 L3S53EA with 8GB of RAM, AMD APU A8-6410 2GHz CPU and AMD R7 M260 2GB GPU and also R5 Graphics 1GB integrated GPU. My OS is Windows 7 Professional 64bit But, in games and stuff, my laptop only uses the R5 one, and completely ignores the R7 M260. GPU-Z sensors while in...