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I currently have two monitors connected to my computer, the following:

[ON LEFT]    [ON RIGHT]
1920x1200     1600x900

When I run wmctrol -d I get the following output:

0  * DG: 1152x864  VP: 0,0  WA: 0,25 3520x1175  1

I also get a similar output of 3520x1200 when running:

xdpyinfo | grep 'dimension' | awk -F: '{ print $2 }' | awk '{ print $1 }' 

Similarly xdpyinfo outputs that my number of screens is 1.

Both outputs suggest that my screen size is close to 3500x1200. However I have two screens, how can I get the dimensions of both monitors separately and then, how can I easily tell which monitor has the currently active window?

Or, how can I change my configuration so my system tells me I have two screens; because that may be the problem by itself.

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Are you using the nVidia binary driver? –  Stephanie Jun 13 '12 at 15:59
    
No I am not. I currently am using the integrated graphics card on my Sandy-Bridge CPU. –  bhutchins Jun 13 '12 at 16:11
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