Xonar DG S/PDIF output

Hi, I'm trying to get S/PDIF work on Xonar DG sound card. I tried to enable Digital stereo (IEC958) output from KDE's settings, unmuted S/PDIF through alsamixer, but still, I cannot get any sound through this. The setup is that I have connected my sound card to my receiver with optical cable.
If it helps, here is some info, I have tried Audio troubleshooting guide, didn't help.

alsa-info
http://www.alsa-project.org/db/?f=f8...50609752686d32