Native resolution does not fill entire external display

I've got one of the original MacBook Pros with the Mobility Radeon X1600 hooked up to a Samsung P2350G display (it's a 23" LCD panel.) The native resolution on the display is 1920x1080.
The display has inputs for both VGA and DVI. The DVI port however is used by a desktop PC already, so I use a DVI to VGA adapter on the MacBook Pro, and use the laptop panel as a secondary display.
The problem is that when I set the external display to its native resolution, I get vertical letterboxing and some flickering along the edges of the image. It does not horizontally fill the whole display as it should. I have tried the same adapter on the PC and it worked fine (though with rather spotty image quality.)
Resolutions that are lower than 1920x1080 work fine and fill the whole display properly. I'm not exactly sure what the issue is. The laptop is only semipermanently attached to the large display so I can live with a reduced image quality there, but the flickering, slightly distorted image is just not acceptable right now.

Sounds like it might be a sync issue. Have you tried powering the monitor off and then back on with the MBP connected to it? How about just temporarily disconnecting the DVI cable from the desktop PC and using that to plug into the MBP.

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First of all I apologize for posting such a long question but in order to best describe the problem I am having with my MacBook Pro, I had to mention every detail.
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First of all I apologize for posting such a long question but in order to best describe the problem I am having with my MacBook Pro, I had to mention every detail.
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Message was edited by:
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Native resolution does not fill entire external display

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