Today I started again to work with the problem (not having compiz with a 
correct 1280x800, screen splitted). 
I found a solution for my configuration, a docked dell d810 with external 
1280x1024 LCD). 

First I did a dpkg-reconfigure xserver-xorg, to start with fresh new xorg.conf, 
because I had a previous old installation. The new xorg.conf is very simple, 
like  showed here
http://www.thinkwiki.org/wiki/Xorg_RandR_1.2

Then, I had only to add a few line in xorg.conf section  Screen to manage the 
docked monitor, which has to manage a 1280x1024 resolution:
       SubSection "Display"
           Depth                24
           Modes                "1600x1200" "1280x1024" "1280x800" "1024x768" 
"800x600" "640x480"
           # ADD A VIRTUAL LINE TO PROVIDE FOR THE LARGEST SCREENS YOU WILL 
HOTPLUG 
           Virtual              2048 2048 
       EndSubSection

And so the laptop works well, with or without docked LCD external monitor. 
The trick is to use a clean xorg.conf, with correct configuration for the new 
xorg-server included in Hardy.

-- 
Screen splited when changing monitor resolution settings 
https://bugs.launchpad.net/bugs/206998
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