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I've been able to extend my monitor onto two displays at once, but I can't get it to work with three. When I use the System Settings > Display, it gives me the following error when I try to output to the third display:

The selected configuration for displays could not be applied

requested position/size for CRTC 148 is outside the allowed limit: position=(3200, 0), size=(1920, 1080), maximum=(3200, 3200)

I know it is possible to extend my display to all three, as I was able to do it in Linux Mint.

Here's the output of xrandr:

Screen 0: minimum 320 x 200, current 3200 x 1080, maximum 3200 x 3200
LVDS connected 1600x900+0+0 (normal left inverted right x axis y axis) 382mm x 215mm
   1600x900       60.1*+
   1440x900       60.1  
   1280x768       60.1  
   1280x720       60.1  
   1024x768       60.1  
   1024x600       60.1  
   800x600        60.1  
   800x480        60.1  
   640x480        60.1  
DFP1 connected (normal left inverted right x axis y axis)
   1920x1080      60.0 +   59.9     30.0     30.0     24.0     30.0     30.0     24.0  
   1776x1000      59.9     24.0     30.0     30.0  
   1680x1050      60.0     59.9     30.0     24.0     30.0     24.0  
   1400x1050      60.0     59.9     30.0     24.0     30.0     24.0  
   1600x900       59.9     24.0     30.0  
   1280x1024      60.0     30.0     24.0  
   1440x900       59.9     24.0     30.0  
   1280x960       60.0     30.0     24.0  
   1360x768       60.0     30.0     24.0  
   1152x864       60.0     30.0     24.0  
   1280x768       60.0     30.0     24.0  
   1280x720       60.0     59.9     30.0     24.0  
   1024x768       30.0     24.0     60.0  
   1152x648       59.9  
   1024x600       30.0     24.0     60.0  
   800x600        30.0     24.0     60.3  
   800x480        30.0     24.0     60.3  
   720x480        30.0     24.0     60.0     59.9  
   640x480        30.0     24.0     60.0     59.9  
CRT2 connected 1600x900+1600+0 (normal left inverted right x axis y axis) 443mm x 249mm
   1600x900       60.0*+
   1280x1024      75.0     60.0  
   1440x900       59.9  
   1280x960       60.0  
   1280x800       59.8  
   1152x864       75.0     60.0  
   1280x768       59.8  
   1280x720       59.8  
   1024x768       75.0     70.1     60.0  
   1024x600       75.0     70.1     60.0  
   800x600        72.2     75.0     60.3     56.2  
   800x480        72.2     75.0     60.3     56.2  
   640x480        75.0     72.8     67.0     59.9  

And here's my xorg.conf file:

Section "ServerLayout"
    Identifier     "amdcccle Layout"
    Screen      0  "amdcccle-Screen[1]-0" 0 0
EndSection

Section "Monitor"
    Identifier   "0-LVDS"
    Option      "VendorName" "ATI Proprietary Driver"
    Option      "ModelName" "Generic Autodetecting Monitor"
    Option      "DPMS" "true"
    Option      "PreferredMode" "1600x900"
    Option      "TargetRefresh" "60"
    Option      "Position" "0 0"
    Option      "Rotate" "normal"
    Option      "Disable" "false"
EndSection

Section "Monitor"
    Identifier   "0-DFP1"
    Option      "VendorName" "ATI Proprietary Driver"
    Option      "ModelName" "Generic Autodetecting Monitor"
    Option      "DPMS" "true"
    Option      "PreferredMode" "1920x1080"
    Option      "TargetRefresh" "60"
    Option      "Position" "3200 0"
    Option      "Rotate" "normal"
    Option      "Disable" "false"
EndSection

Section "Monitor"
    Identifier   "0-CRT2"
    Option      "VendorName" "ATI Proprietary Driver"
    Option      "ModelName" "Generic Autodetecting Monitor"
    Option      "DPMS" "true"
    Option      "PreferredMode" "1600x900"
    Option      "TargetRefresh" "60"
    Option      "Position" "1600 0"
    Option      "Rotate" "normal"
    Option      "Disable" "false"
EndSection

Section "Device"
    Identifier  "amdcccle-Device[1]-0"
    Driver      "fglrx"
    Option      "Monitor-LVDS" "0-LVDS"
    Option      "Monitor-DFP1" "0-DFP1"
    Option      "Monitor-CRT2" "0-CRT2"
    BusID       "PCI:1:0:0"
EndSection

Section "Screen"
    Identifier "Screen0"
    Device     "Card0"
    Monitor    "Monitor0"
    DefaultDepth     24
    SubSection "Display"
        Virtual   8192 1080
        Modes    "1600x900"
    EndSubSection
EndSection

Section "Screen"
    Identifier "amdcccle-Screen[1]-0"
    Device     "amdcccle-Device[1]-0"
    DefaultDepth     24
    SubSection "Display"
        Viewport   0 0
        Virtual   3200 3200
        Depth     24
    EndSubSection
EndSection

I would be extremely thankful for any help :)

Edit: I'm running Ubuntu 12.04, and my graphics card is a Raedon 5700HD series.

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