I have a radeon hd 5570 graphics card and I'm only getting an option for stereo sound through amd hdmi output? It's happened I think after I "upgraded" to windows 10 from windows 7. It worked fine with windows 7. Had true digital surround signal being sent through hdmi from graphics card so I know it will do it but can't seem to figure out how to get it to work with windows 10. I have checked and driver is up to date. I also have a splitter that splits the sound from the video. One goes to flat screen digital audio cable goes to stereo..