I have two stereo speaker sets. For past couple of days I have been trying to get them to work in 4.0 surround configuration.
What I have tried is connecting one set to the main (Green Connector) on the motherboard and another to the next blue one (see the image). Post this, I have tried various configuration in pulseaudio but to no effect. I have also tried the similiar approach on WinXP (running as guest on VirtualBox) but to no effect. The speaker connected to the main line always outputs sound, while the other one does not give any output at all.
I have tried MPlayer, SMPlayer, audacious, WMP, Winamp and SPlayer with different configurations but no results.
Note: The underlying audio file is encoded as 5.1 AC3. However, I have tried typical stereo MP3, OGG, AAC, MP4 etc.