[CentOS] dual head on laptop

I am trying to use the system-config-display utility to setup a
laptop for dual-heal.

I want my LCD to be 1024x768 and external VGA to be 1366x768.
I presume the LCD will go virtual or something to match the 1366x768
which is fine.

When I am setting up the dual head and click OK nothing happens???

On the console I have something about 
secondVideoCardOptionMenu.get_menu().get_active().get_data("NAME")
attribute error.

There is no second video card in a laptop????

How do setup the VGA port to be different than the LCD?

Thanks,

jerry

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