Maybe this workaround can help you also in the suspend case: 
http://it-tactics.blogspot.com/2010/08/ubuntu-1004-with-docking-station.html
I noticed that after these changes my Desktop is much more stable in the 
meaning of flickering and resolution changes (which also happened e.g. when 
starting TeamViewer (and other applications) for the first time.
The bug #613650 and bug #617421 could be related to this one I guess.

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external monitor output is switched off when closing the laptop-lid when 
gnome-power-manager is set to blank screen on closing
https://bugs.launchpad.net/bugs/390816
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