Venkat sir did you try the same setup
1. with other DVDs (with dolby digital/dts)
2. updated firmware of the ps3
I use the ps3 the same way as earlier mentioned in the post with my okyo 606 and get passthrough dts/dolby 5.1 to the receiver.
I am sure the PS3 can send data in raw format. Only thing was I did not know how to set it up. I shall follow Shailendra's advise and check in the DVD/BD option.
I did try with 2 or 3 DVDs, and the issue were the same. In addition to Iron Man, I tried I Robot, The Curious Case of Benjamin Button, and a DTS version of Sivaji.
I am quite sure I can set the PS3 to send data in raw format. I shall confirm this once I do it in reality.
Cheers