All the games are playing on Intel HD 5500 not in AMD

Hi,

I have problem in Lenovo Z51 70 laptop. The problem is that all the games are playing on intel HD 5500 Graphics not on AMD Radeon R9 M375. I have checked in Device manager that two of the graphics shows over there and amd software are working but its not working on games i think then went to dxdiag and went to display it shows the details of intel graphics no amd detail in there so what i have do about it ?Please help me in this.

Regards

Visakh