I can't seem to get the Optical out line to output straight Digital surround sounds to my Home Theater Receiver (5.1, 7.1, etc).

The receiver still shows as 2CH Stereo input it received from the opt in.

The system test shosw 5.1CH fine (Using PC Speaker). However, when tested on the receiver, it can only play black L&R and there's no tone come out of the Center/SL and SR speakers.

Please advise.

Thanks a lot.