In the case of my Samsung LCD it only sends two channel from it's optical out. Copy protection stuff I believe. Check your manual but yours is probably the same if a relatively recent model. Could help a bit more if you indicated what connections your AVR, TV and other equipment has.
In general, if you want video and sound you can go HDMI directly from the devices to your TV although this will limit you to your stereo TV. That's okay if your source is two channel (e.g. laptop) unless you want the higher quality of your AVR.
If you want surround and video you can go a couple ways:
1. If your AVR has HDMI connections connect your HDMI device outputs to HDMI AVR inputs, connect the (likely) single HDMI out from your AVR to you TV. Control source selection via the AVR and listen through the AVR. Simple
2. If you want kind of a hybrid setup or don't have enough HDMI or don't always want surround there are some other possibilities.
I'm assuming your TV has at least two or three HDMI inputs. Hook the "part-time surround" devices directly to the TV via HDMI. Connect their auxiliary SOUND outputs to the AVR. For example your BDP likely has optical out, or maybe coax out. Connect that to the AVR (as well as the HDMI direct to TV). When you want surround, turn on your AVR and select appropriate input there for full surround (and also correct HDMI input on TV). I do this with my cable box. Don't always want or need surround so HDMI from cable box to TV and DIGITAL COAX from cable box to AVR.
If unclear provide your equipment for better answer.