I am running 64-bit Ubuntu 13.10 with Unity and have dual (2) Radeon HD6450 video cards and 4 Hanns-G HL273 monitors. Each Radeon card is driving one monitor via DVI and the other via VGA. I am running the proprietary video drivers from AMD's web site: "amd-catalyst-13.11-beta V9.4-linux-x86.x86_64.run" I tried to use "amd-catalyst-13.12-linux-x86.x86_64.run" but could not get that newer version to install.

What I need help with is how to "correct" my xorg.conf file and any other needed instructions to get all four of my monitors to work as a continuous desktop that allows me to drag things from one monitor to the next, etc.

When I tried to use the default open source drivers that came in Ubuntu 13.10, only three of the monitors would work. Now that I am running the proprietary ones, all four monitors come on and I can move my mouse from one end to the other--but only the right-most monitor displays my desktop and allows me to "do anything". Any time I move my mouse to any of the other three monitors (which display all-white), it turns into an "X" and does not do anything else but move. Enabling xinerama makes all four displays go all-black after login.

I do have amdcccle installed, but it does not seem to have the ability to handle my particular configuration.

My Current xorg.conf:

Section "ServerLayout"
Identifier "Basic Layout"
Screen 0 "Screen1" 5760 0
Screen 1 "Screen0" 0 0
Screen 2 "Screen2" 3840 0
Screen 3 "Screen3" 1920 0
EndSection

Section "Module"
EndSection

Section "Monitor"
Identifier "0-DFP2"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1920x1080"
Option "TargetRefresh" "60"
Option "Position" "0 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection

Section "Monitor"
Identifier "0-CRT1"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1920x1080"
Option "TargetRefresh" "60"
Option "Position" "0 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection

Section "Monitor"
Identifier "1-DFP2"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1920x1080"
Option "TargetRefresh" "60"
Option "Position" "0 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection

Section "Monitor"
Identifier "1-CRT1"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1920x1080"
Option "TargetRefresh" "60"
Option "Position" "0 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection

Section "Device"
Identifier "Device0"
Driver "fglrx"
Option "Monitor-CRT1" "1-CRT1"
BusID "PCI:1:0:0"
EndSection

Section "Device"
Identifier "Device1"
Driver "fglrx"
Option "Monitor-DFP2" "0-DFP2"
BusID "PCI:4:0:0"
EndSection

Section "Device"
Identifier "Device2"
Driver "fglrx"
Option "Monitor-DFP2" "1-DFP2"
BusID "PCI:1:0:0"
Screen 1
EndSection

Section "Device"
Identifier "Device3"
Driver "fglrx"
Option "Monitor-CRT1" "0-CRT1"
BusID "PCI:4:0:0"
Screen 1
EndSection

Section "Screen"
Identifier "Screen0"
Device "Device0"
DefaultDepth 24
SubSection "Display"
Depth 24
EndSubSection
EndSection

Section "Screen"
Identifier "Screen1"
Device "Device1"
DefaultDepth 24
SubSection "Display"
Depth 24
EndSubSection
EndSection

Section "Screen"
Identifier "Screen2"
Device "Device2"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection

Section "Screen"
Identifier "Screen3"
Device "Device3"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection