Hello Folks,

I'm new at configuring Linux so please have some patience with me. I'm trying to set up a dual head display with one desktop stretched out on both screens. I have an ATI X800 and due to recommendations from this guide https://help.ubuntu.com/community/RadeonDriver I'm trying to achieve this with the open source ati driver and xrandr.

It's actually sort of working, I do have the desktop stretched out over both screens and I can drag windows from one screen to another. The thing is that on the right side of the right screen these is a wide stripe, that doesn't show the desktop backgroud, but rather some kind of "shadows" of the windows being dragged over it. Can anyone please help me a bit?

Here is my xorg.conf

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"kbd"
	Option		"XkbRules"	"xorg"
	Option		"XkbModel"	"pc105"
	Option		"XkbLayout"	"de"

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"

Section "Device"
	Identifier	"Configured Video Device"
	Driver          "ati"

Section "Monitor"
	Identifier	"Configured Monitor"
	HorizSync	39.0 - 69.0
	VertRefresh	59.0 - 61.0
	Option		"DPMS"

Section "Screen"
	Identifier	"Default Screen"
	Monitor		"Configured Monitor"
	Device		"Configured Video Device"
	DefaultDepth	24
        SubSection "Display"
                Depth	24
                Modes	"1280x1024"
		Virtual	2560 1024 

Section "DRI"
        Mode 0666

Section "ServerLayout"
	Option		"AIGLX" "true"
	Identifier	"Default Layout"
	Screen		"Default Screen"

The output of xrandr -q:
Screen 0: minimum 320 x 200, current 2560 x 1024, maximum 2560 x 1024
VGA-0 connected 1280x1024+1280+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1600x1024      60.0  
   1280x1024      59.9*    60.0  
   1440x900       60.2  
   1280x960       60.0  
   1280x800       60.0  
   1280x768       60.0  
   1024x768       60.0  
S-video disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
   1280x1024      60.0*+   75.0     59.9  
   1152x864       75.0  
   1024x768       74.9     75.1     60.0  
   832x624        74.6  
   800x600        75.0     74.9     60.3  
   640x480        75.0     74.8     60.0  
   720x400        70.1

And what I did to switch the dual screen desktop on was:

xrandr --output DVI-0 --left-of VGA-0