Macbook air mini dp output resolution / full screen app issues

I've successfully connected my new macbook air 13" to my LED tv with a mini DP to hdmi adapter + hdmi wire. I am able to get video and audio (obviously.)
My issue is that no matter when resolution I try (1080p, 1080i, 720p, etc) and wether I am "mirroring" the display or "extending" the display,
My samsung 46" LED tv can not get full screen there is always black bars on the left and right.
When I connect my PC via VGA wire there are no bars and it is in full land scape view.
Also I've noticed in lion that full screen apps show up as the "linen wallpaper" on the second display.
the only way i can slightly alleviate the problem is full screening a video within youtube but not within the OS it self... even then there is still black bars which is weird because when i use the TV as a extended monitor the wallpaper is using the whole display just full screen video has black bars.
I am unable to get 1920 x 1200 output display to my HDTV is this possible? is it my mini DP to hdmi adapter that is at fault?
thanks in advanced to whoever helps sorry about the long post my brain is scattered on the issue because my VGA connetion works fine i don't understand why HDMI + mini DP has worse resolution...

No, it doesn't list the resolution explicitly like that - the top few items in the list are "480i", "480p", "720p", "1080i" and "1080p", each with a small TV icon to the right. Non-television resolutions follow, and are listed with explicit pixel dimensions (and no TV icon), but the list stops at 1440x900, the native resolution of the MacBook's built-in display; it doesn't list resolutions higher than that.
Needless to say, I've tried every setting in the entire list, and they all suffer from the same problem of displaying shrunk down on the plasma TV with a margin around the desktop.
I wonder if the difference between your Display control panel and mine is that I'm running Snow Leopard? (Sorry - no screen grabs to show, I'm at work right now)

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http://support.apple.com/kb/HT1573
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Macbook air mini dp output resolution / full screen app issues

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