What is the model number of the XBR? Prior to the XBR2 and 2000 series, you could not input 1080p, only 1080i. Your output would be 1080p, though, which I am assuming is your displays native resolution. Thanks...Will
P.S. What you're seeing when you press 'display' on your Sony is the input resolution, not the output.
The one thing I noticed on my Sony RPTV with 1080p/24 is with the latest firmware 2.7 my a20 and a2 have handshaking issues with HDMI now before on 2.5 it had no issues. However the latest firmware works flawlessly with both my Toshiba 1080p/24 LCD tvs. I doubt this is intentional but who knows.