Well, I like it much more when all my speakers work together. And because of it only plays 2 of my speakers, sound is not very clear and no fun to listen to music like this. I know this card can do what I want, but drivers are just too bad.

My settings are the same as you said. I get 5.1 audio from games. I think upmixing should be done within the STX, only 2.1 (stereo) source should be upmixed to 5.1 and 5.1 source should not be changed.

No I did not disable it from the bios, I disabled it from the device management in windows. I want to upmix from 2.1 to 5.1   In windows 8.1 I could set everything as I wanted, after upgrading to windows 10, it was still working, then I wanted to do a clean install and could not set it up again.

I'm using Denon X2000 AVR, and I believe it is configured properly. I get surround sound from games, but firefox, spotify, etc only outputs front left and right. According to tkoreaper's answer, RCA (analog) connectors will only output stereo sound to my AVR, even if I set upmix stereo to...

I have also tried those drivers, but never got upmix working with them. With the stock one, I can sometimes get it working if I'm lucky, but not this time, after upgrading to Windows 10 :(   Everything except the real surround sound sources (firefox, spotify, etc) play only front left and...

I bought this card and I wonder if I can connect this to my AVR using analog output and get 5.1 sound? I'm currently using SPDIF optical output and having problems with audio delay and upmixing. I think asus drivers are broken and they work if you are lucky enough...