I think the lights don't normally indicate speakers - as opposed to the incoming digital audio stream.
if the DVD player is connected via digital coax/optical, and you see two lights (L and R) could be your DVD player is sending PCM Stereo to the receiver - check the player setup and set it to send raw or bitstream to the receiver
if there are no lights at all, it probably means you have connected the DVD player using the stereo analog connections. see if you can use a digital connexion instead
(the 5.1 sound being OK is testament to how good Dolby PLII/PLIIx is)
if the DVD player is connected via digital coax/optical, and you see two lights (L and R) could be your DVD player is sending PCM Stereo to the receiver - check the player setup and set it to send raw or bitstream to the receiver
if there are no lights at all, it probably means you have connected the DVD player using the stereo analog connections. see if you can use a digital connexion instead
(the 5.1 sound being OK is testament to how good Dolby PLII/PLIIx is)