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I am trying to enable three monitors for my setup in Ubuntu 12.10. My card is a Raedon 5700 HD series. When I try to extend my display to any additional monitors, I get the following error:

required virtual size does not fit available size: requested=(3200, 900), minimum=(320, 200), maximum=(1600, 1600)

All I should have to do is increase my maximum resolution to a larger value. For example, let's say that I had three monitors with 1600x900 resolution. I would need to change it to 4800x900 (correct me if I'm wrong). How would I go about doing this?

This is my xorg.conf file. I'm not sure if I'll need to edit this. I don't even know where these values are stored. I'm not very good with Linux, so please try to explain in as simple terms as possible.

Section "Screen"
    Identifier  "Default Screen"
    DefaultDepth    24
EndSection

Section "Module"
    Load    "glx"
EndSection
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