I looked up that set and it's native resolution is 1024x768 (which means it uses rectangular pixels). Most sets that say they are 720p just means that have a native vertical resolution of 720 or 768 pixels. They take 1280x720 as an input (and often 1920x1080i) but scale it down to its native res of 1024x768 (so you'll lose a little horizontal information in picture but it will look like 720p). My plasma has a native resolution of 1024x768, but I'm passing it 1280x720 (it should be fairly well optimized to take that resolution for TV signals, since that's what set top boxes will send it). I know I didn't set DPI in xorg - I have to look at nvidia settings - but as your are using ATI, I'm not sure how to help - I avoid ATI like the plague.
What resolution are you passing through?
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