40" HDTV detected as 7" over HDMI cable

I have a Samsung 40" HDTV with 1920x1080 resolution and I'm trying to make a MythTV box that connects to it with an HDMI cable. I also have an Intel x4500 video card so I'm running the xf86-video-intel driver and no xorg.conf at the moment. For some reason, the TV is detected as a 7" screen which makes everything on it HUGE. I suppose I could make an xorg.conf to force the correct resolution but it seems to me a better solution is to figure out how to make the screen be autodetected correctly. I'm guessing this is done by looking up specs in a file somewhere? Maybe I could even submit a patch (never done that before) if I could figure this out.
Could anyone point me in the right direction to learn about how monitor autodetection works?

if the tv has to be set to vga, does that mean that the hdmi cable cannot be used? I tried it once where i put the hdmi cable in and then hit the windows key and p to connect it to projector and the Panasonic TV showed up as an option. But I cant get it to show up again. My laptop doesnt seem to recognize the tv at all.

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Type:          Display
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Slot:          Slot-1
PCIe Lane Width:          x16
VRAM (Total):          256 MB
Vendor:          NVIDIA (0x10de)
Device ID:          0x0393
Revision ID:          0x00a1
ROM Revision:          3008
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Cinema HD:
Resolution:          1920 x 1200
Depth:          32-Bit Color
Core Image:          Hardware Accelerated
Main Display:          Yes
Mirror:          Off
Online:          Yes
Quartz Extreme:          Supported
Rotation:          Supported
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40" HDTV detected as 7" over HDMI cable

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