I have tried Realtek's R2.79 drivers Win10 圆4. Windows 10, PC connected HDMI to my Samsung TV, and digital optical out through a Realtek soundcard to my Pioneer receiver (DD and DTS capable).
See screenshots below of all of my settings screens: However there appear to be a few different possibilities, and while some noted to fix it using unlocked Realtek drivers, I have tested this myself with the following results.
There are many forum threads around the web about Windows 10 breaking Surround Sound / 5.1 DTS / 5.1 Dolby, etc.
