As promised, here are the two configuration files:
/etc/X11/xorg.conf
Code:
Section "Monitor"
Identifier "DELL2408_R"
EndSection
Section "Monitor"
Identifier "DELL2408_L"
Option "LeftOf" "DVI-I_1/digital"
EndSection
Section "Device"
Identifier "HD4870"
Driver "radeonhd"
VendorName "ATI Technologies Inc"
BoardName "RV770 [Radeon HD 4870]"
BusID "PCI:1:0:0"
Option "DVI-I_1/digital" "DELL2408_R"
Option "DVI-I_2/digital" "DELL2408_L"
EndSection
Section "Screen"
Identifier "MyScreen"
Device "HD4870"
DefaultDepth 24
SubSection "Display"
Depth 24
Virtual 3840 1200
EndSubSection
EndSection
dual screen startup script
Code:
#!/bin/sh
xrandr --output DVI-I_1/digital --right-of DVI-I_2/digital