Re comment 6: I get this in Maverick too. I've found the advice in this forum 
post helpful: http://ubuntuforums.org/showthread.php?t=1047029
Basically you can use the command-line to tell nvidia-settings to reset which 
displays are present. It then properly forgets about the old display and allows 
you to use the dialog to detect the new one. I'm using the latest packaged 
drivers (260.19.06-0ubuntu1)
Here's a short script that should reset to only using the laptop's local LCD:

#!/bin/bash
echo Current display status
nvidia-settings -d -q AssociatedDisplays
echo Configuring to only know about LCD display
nvidia-settings -a AssociatedDisplays=0x00010000
echo Updated display status
nvidia-settings -d -q AssociatedDisplays


** Changed in: nvidia-settings (Ubuntu)
       Status: Incomplete => New

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to nvidia-settings in Ubuntu.
https://bugs.launchpad.net/bugs/526955

Title:
  NVIDIA X Server configuration not working

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