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I am following this below link for setting up the dual monitor.

"https://wiki.ubuntu.com/X/Config/Resolution#How to setup a dual monitor" 

If I uncheck "Same image in all monitors". The system tells me to log out and back in again. When I do that, there's the same image on both monitors and the checkbox was automatically checked(The old state.)

I did not find any change in the xorg.conf file in my /etc/X11 folder too.

Can you please point me to solution for this problem?

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Too much information is missing. Like your setup, your hardware etc... –  Bobby Apr 19 '11 at 7:00

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