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hey SkullBurner,
I'm having the exact same problem! I have Ubuntu 10.04 64-bit on an Alienware m15x laptop with Nvidia GeForce 8800M GTX and in nvidia-settings I have my laptop display disabled and use only my external. When I have my laptop "lid" closed I only get a blank screen for my screensaver where when the laptop lid is open I get the screensaver. Same thing with "put the display to sleep" function; it works when laptop lid is open, but once it's closed my external will just stay on a blank screen forever, I have to shut off the screen when I go away for a while.
I've posted this problem on the ubuntu forums and haven't heard back. It's a really annoying problem. I think it might have something to do with the fact that I'm using nvidia settings to configure the displays. Maybe gnome can't detect the nvidia settings I've made and it just sees the my laptop screen is disabled and thinks I don't have an external???
Could you post what kind of graphics card you have, what you use to configure the displays.