I have received the cable, and it works, the only question is there is a bit noise from the speaker. I thought opitcal cable should have less noise(interfer) . When it was playing something, I will not be able to hear the noise. But when it stands by, yeah, it is there. Don't know why?
Spend some time with the settings. Smart volume management can do this, SMV. Or auto sound volume adjusting features. Turn them off if your computer software has it. Try adjusting volumes to on the computer and in the receiver. Usually I keep my computer low and use the receiver more to amplify the sound. Like anything usually you just have to play with the settings or disable a software enhancement or something.
My guess is it is something like the smart volume management. The optical cable will have zero interference.