PS3 Settings Question

[Bradders79]

Hi In Relation to the above, I have my ps3 connecting to my sony htsf 1100 via hdmi, the audio and video appears to go through the hdmi(ie when i unplug the digital opitical cable there is no loss of sound)
in the settings i have set to hdmi and automatic, but yet it only choose the 2 linear pcm 2 channels settings to go forward and non of the rest of the massive list including the 5.1 lcm channels, surely it should be tick checking a couple of these aswell for the surround sound, and if not should i be doing this manually instead of using automatic.
please help