cannot setup 5.1 surround

[Schony125]

Hello guys I cannot setup my 5.1 samsung Hi-FI/blurey reader.

I have DP into my monitor and an HDMI to the Hi-Fi from an asus strix 390 with an asus p9x79 Mobo on win 7

 

I tried to run from the Realtek but didnt detect and it was playing no sound even if in the mixer thing of windows you could actually see the sound bars go up and down.

 

So I reed about Realtek conflicting with amd sound drives on win 7 so I disintalled realtek and the audio started working.

 

If I go on Catalist the GPU detects 2 screens: one is my samsung monitor and the other one the samsung Hi-Fi.

If you go to the far right of the screen the pointer goes away like it has another screen.

 

The problem is that I cannot run it on 5.1 it just plays as stereo.

What can I do?