Why does my external monitor name and resolution change when I close the lid?

When I close my lid on my early 2001 MBP, the external monitor reverts to a lower resolution.  I am not even able to select the proper resolution.  
I am using VGA (I need VGA for my KVM).   When the lid is open, the monitor sees the correct monitor, and I can set the correct resolution.   When the lid closes, it only shows a genertic VGA monitor and defaults to a lower resolution.  I am not able to change the resolution up when I have the lid closed as well.   Does anyone have any insight into this?

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