X11 dual head - want to get window manager (gnome) on one screen only

What I want sounds simple, but I just can't get it done... Hope anyone is able to help me!
What I've got:
Four monitors (two at each of my nVidia graphic cards). Both devices are configured using nVidia's Twinview, giving me two virtual screens (:0.0 and :0.1).
I can use xinerama to get one huge desktop, but this doesn't work well, as the borders between two screens of the same device are no longer recognized in this case, causing windows to always span over two monitors on maximization.
I can also not use xinerama, giving me two independant gnome session.
What I want:
I want gnome to only start on one screen (i.e. two monitors), leaving the other screen blank but available. They don't need a WM as they will run nothing but a fullscreen mplayer or an xterm that will periodically output some stuff. I actually don't even need input devices for the second screen and it would be good if the mouse was restricted to the gnome-screen.
However, I didn't manage to make gnome start on only one screen. I don't care if it's done using one xsever with two screens attached or if I can do it starting a second xserver, I just want it resolved in some way.
I've tried to restrict gnome to :0.0 by setting the DISPLAY variable or giving gnome-sessions --display option. Both to no avail. When trying to start a second xsever (different layouts, each using one of the screens), my original screen becomes all white and on the second screen nothing happens. Any ideas?

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I have 1680x1050 and 1280x1024 monitors which I would like to setup so that I have two displays (:0.0 and :0.1), i.e. can't drag a window to the other display, but can move the mouse from one screen to the next. The graphics card is Radeon HD 4850.
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Section "ServerLayout"
Identifier "dual head configuration"
Screen 0 "Screen0" 0 0
Screen "Screen1" RightOf "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Files"
EndSection
Section "Module"
Load "glx"
Load "dri"
Load "drm"
EndSection
Section "InputDevice"
# keyboard added by rhpxl
Identifier "Keyboard0"
Driver "kbd"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
EndSection
Section "Monitor"
Identifier "Monitor0"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
DisplaySize 444 277
EndSection
Section "Monitor"
Identifier "Monitor1"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
DisplaySize 339 271
EndSection
Section "Device"
Identifier "Videocard0"
Driver "radeon"
BusID "PCI:2:0:0"
EndSection
Section "Device"
Identifier "Videocard1"
Driver "radeon"
BusID "PCI:2:0:0"
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Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
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SubSection "Display"
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Depth 24
Modes "1680x1050"
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EndSection
Section "Screen"
Identifier "Screen1"
Device "Videocard1"
Monitor "Monitor1"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "1280x1024"
EndSubSection
EndSection
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(==) ServerLayout "dual head configuration"
(**) |-->Screen "Screen0" (0)
(**) | |-->Monitor "Monitor0"
(**) | |-->Device "Videocard0"
(**) |-->Screen "Screen1" (1)
(**) | |-->Monitor "Monitor1"
(**) | |-->Device "Videocard1"
(**) |-->Input Device "Keyboard0"
It doesn't look as if xrandr can help as it reports a maximum virtual desktop of 1680x1680.
Because the two monitors are different resolutions I don't know if a single screen is the answer.
I used to have two displays/screens configured to two different resolutions matching the monitors using the catalyst driver but can't get it working using the xf86-video-ati driver.
Any help would be appreciated.
Thanks
Willem
Last edited by Willem (2010-01-02 20:42:41)

Thanks, with your help I was able to get it working.
The xorg.conf relevant sections:
Section "ServerLayout"
Identifier "dual head configuration"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "Monitor"
Identifier "Monitor0"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
DisplaySize 444 277
EndSection
Section "Monitor"
Identifier "Monitor1"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
DisplaySize 339 271
Option "RightOf" "Monitor0"
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Section "Device"
Identifier "Videocard0"
Driver "radeon"
BusID "PCI:2:0:0"
Option "Monitor-HDMI-0" "Monitor0"
Option "Monitor-DVI-0" "Monitor1"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
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Depth 24
Virtual 2960 1050
EndSubSection
EndSection
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X11 dual head - want to get window manager (gnome) on one screen only

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