Using DVI - HDMI cable output to Samsung LCD TV

For some reason, i have been using the DVI -> VGA Adapter with a VGA cable outputted to my new Samsung LCD TV, with resolution 1920x1080. I purchased a DVI -> HDMI Cable, but the quality/resolution is subpar to using the VGA Cable, it seems as if the resolution is upscaling itself, but according to Display Preferences, it is outputting at 1920x1080i, When i'm using the VGA cable it just says 1920x1080, without i or p.
Anyone know why?

I've been trying to communicate with a Samsung LE40A656 via a DVI-HDMI cable.
I think there must be issues with HDMI on that model because the TV can't detect a signal on the HDMI port and the MPB can't see a monitor.
But I have managed to get full screen via the Apple DVI-VGA adaptor and the D-sub port on the Samsung using the specification in this archive thread:
http://discussions.apple.com/thread.jspa?messageID=6400626&#6400626
Before I upgraded my TV I had a cheap(ish) Hyundai Vuon with a DVI port which worked fine with my MBP.
Would still like to know why HDMI doesn't work on the Samsung.
Adrian

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As you can see the totals are in both cases 1688 750. As soon as you don't respect this totals, like in this example:
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webman2k wrote:
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Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "Screen0" 0 0
InputDevice "Logitech MX1000" "CorePointer"
InputDevice "BenQ x700" "CoreKeyboard"
EndSection
Section "Files"
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Load "xtrap"
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Driver "kbd"
EndSection
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EndSection
Section "Monitor"
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Identifier "7600GT"
Driver "nvidia"
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Section "Screen"
Identifier "Screen0"
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EndSection
Section "Extensions"
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EndSection

*"Does the DVI connection on the side of my MacBook Pro work as an input or just an output?"*
Output only.

Using DVI - HDMI cable output to Samsung LCD TV

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