Including my /etc/X11/xorg.conf:
Section "ServerLayout" Identifier "aticonfig Layout" Screen 0 "aticonfig-Screen[0]-0" 1440 0 Screen "aticonfig-Screen[1]-0" 0 0 EndSection
Section "Module" EndSection
Section "ServerFlags" Option "Xinerama" "on" EndSection
Section "Monitor" Identifier "aticonfig-Monitor[0]-0" Option "VendorName" "ATI Proprietary Driver" Option "ModelName" "Generic Autodetecting Monitor" Option "DPMS" "true" EndSection
Section "Monitor" Identifier "aticonfig-Monitor[1]-0" Option "VendorName" "ATI Proprietary Driver" Option "ModelName" "Generic Autodetecting Monitor" Option "DPMS" "true" 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 "0-CRT2" Option "VendorName" "ATI Proprietary Driver" Option "ModelName" "Generic Autodetecting Monitor" Option "DPMS" "true" Option "PreferredMode" "1440x900" Option "TargetRefresh" "60" Option "Position" "1920 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" "1440x900" Option "TargetRefresh" "60" Option "Position" "0 0" Option "Rotate" "normal" Option "Disable" "false" EndSection
Section "Device" Identifier "aticonfig-Device[0]-0" Driver "fglrx" Option "Monitor-CRT1" "0-CRT1" Option "Monitor-CRT2" "0-CRT2" BusID "PCI:1:0:0" EndSection
Section "Device" Identifier "aticonfig-Device[1]-0" Driver "fglrx" Option "Monitor-CRT1" "1-CRT1" BusID "PCI:4:0:0" EndSection
Section "Screen" Identifier "aticonfig-Screen[0]-0" Device "aticonfig-Device[0]-0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Virtual 3360 1920 Depth 24 EndSubSection EndSection
Section "Screen" Identifier "aticonfig-Screen[1]-0" Device "aticonfig-Device[1]-0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection
Including my /etc/X11/xorg.conf:
Section "ServerLayout" Screen[ 0]-0" 1440 0 Screen[ 1]-0" 0 0
Identifier "aticonfig Layout"
Screen 0 "aticonfig-
Screen "aticonfig-
EndSection
Section "Module"
EndSection
Section "ServerFlags"
Option "Xinerama" "on"
EndSection
Section "Monitor" Monitor[ 0]-0"
Identifier "aticonfig-
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
EndSection
Section "Monitor" Monitor[ 1]-0"
Identifier "aticonfig-
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
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 "0-CRT2"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
Option "PreferredMode" "1440x900"
Option "TargetRefresh" "60"
Option "Position" "1920 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" "1440x900"
Option "TargetRefresh" "60"
Option "Position" "0 0"
Option "Rotate" "normal"
Option "Disable" "false"
EndSection
Section "Device" Device[ 0]-0"
Identifier "aticonfig-
Driver "fglrx"
Option "Monitor-CRT1" "0-CRT1"
Option "Monitor-CRT2" "0-CRT2"
BusID "PCI:1:0:0"
EndSection
Section "Device" Device[ 1]-0"
Identifier "aticonfig-
Driver "fglrx"
Option "Monitor-CRT1" "1-CRT1"
BusID "PCI:4:0:0"
EndSection
Section "Screen" Screen[ 0]-0" Device[ 0]-0"
Identifier "aticonfig-
Device "aticonfig-
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Virtual 3360 1920
Depth 24
EndSubSection
EndSection
Section "Screen" Screen[ 1]-0" Device[ 1]-0"
Identifier "aticonfig-
Device "aticonfig-
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection