I have just hooked a Sony DVD Home Theater System (5 speakers + digital amplifier) to my onboard optical digital sound port on my computer. Using 'sound' through the control panel, I am able to test and hear the Realtek Digital Output in 5.1, using the encoded format of 'dolby digital'. However, when playing games (ex: Starcraft 2, Left 4 Dead), even though I have 5.1 set up on the game options menu, it plays only through front (right/left).
Does anyone have any suggestions for correcting this issue? Relevant Details: Motherboard: MSI P55-GD80 Digital Amplifier Model Number: DAV-FX900W