Audio pass through question. PC - A/V recevier - tv decoding issue

So I have my PC A/V output from hdmi out, goes to receiver, which passes through to the TV.

The PC is showing audio out to Samsung (tv).

I am getting correct sound on 3.1 (L C R Sub). I don't think the receiver is decoding it correctly as the PC is showing the TV as audio and the receiver is not switching any dolby setting on the display.

I know I read something about that happening where the audio just passes though the receiver to the tv and messing up the decoding but I can't find it again.

If this is the case would sending the A/V from the computer straight to the tv then toslink out to receiver be better?

Gone through the wiki/audio section and I thought that was where I heard of the possible problem. Maybe it is but dang I feel as if my brain is a little fried... lol