I installed everything, running in test mode, with the ALC892.
In Realtek Digital Output (using a SPDIF optical cable), I selected the Dolby Digital Live (5.1 Surround).
My receiver says it's receiving DD or DTS accordingly.
However, whether I play music, a movie, or a game, the sound still only comes out of my two front speakers. Center speaker and the two back speakers are dead silent.
I don't understand why, or what I'm doing wrong. I also can't select the "speaker fill" option to copy the stereo audio to the back speakers, or enable DTS connect on my digital output because it asks for 5.1 speaker configuration and I can only do that on the laptop's speakers or for the headset (analogue) jack.