Is it HDCP compliant though? If it's not then you're not going to get very far.
What make/model of monitor is it?
You can select multiple sound outputs at the same time after a firmware update, I have sound going thru HDMI and Optical now.Even if it fully worked, I'm not sure how you're supposed to get sound from it.
But would like an answer, what do you guys do if you have a 16:10 monitor hooked upto a PS3?