I'm trying to make the migration from windows to linuxMint. My system has four screens using two cards. I want to set it up to have a single desktop that I can drag windows from one screen to another. Nvidia Twinview works great for two screens but not for four. That leaves me with using xinerama. However I'm experiencing a glitch. When I setup even two screens (starting simple) the mouse and picture seem to be offset by a screen. So say I have a folder on the desktop. It appears to be located on the right screen but to open it I have to click in the same location on the left screen.

anyone have any ideas?

Here is my xorg.conf

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 270.29 (buildd@allspice) Fri Feb 25 14:42:07 UTC 2011

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 270.41.06 (buildmeister@swio-display-x86-rhel47-08.nvidia.com) Mon Apr 18 15:14:00 PDT 2011

Section "ServerLayout"

# Removed Option "Xinerama" "0"
Identifier "Default Layout"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" RightOf "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "1"
EndSection

Section "InputDevice"

# generated from default
Identifier "Keyboard0"
Driver "keyboard"
EndSection

Section "InputDevice"

# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection

Section "Monitor"
Identifier "Configured Monitor"
EndSection

Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "ViewSonic VX2250 SERIES"
HorizSync 24.0 - 82.0
VertRefresh 50.0 - 75.0
EndSection

Section "Monitor"
Identifier "Monitor1"
VendorName "Unknown"
ModelName "ViewSonic VX2250 SERIES"
HorizSync 24.0 - 82.0
VertRefresh 50.0 - 75.0
EndSection

Section "Device"
Identifier "Configured Video Device"
Driver "nvidia"
EndSection

Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 7900 GS"
BusID "PCI:3:0:0"
Screen 0
EndSection

Section "Device"
Identifier "Device1"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 7900 GS"
BusID "PCI:3:0:0"
Screen 1
EndSection

Section "Screen"
Identifier "Default Screen"
Device "Configured Video Device"
Monitor "Configured Monitor"
SubSection "Display"
Modes "nvidia-auto-select"
EndSubSection
EndSection

Section "Screen"

# Removed Option "metamodes" "DFP-0: 1920x1080 +0+0; DFP-0: nvidia-auto-select +0+0"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "TwinView" "0"
Option "metamodes" "DFP-0: 1920x1080_60_0 +0+0; DFP-0: 1920x1080 +0+0; DFP-0: nvidia-auto-select +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection

Section "Screen"

# Removed Option "metamodes" "DFP-1: nvidia-auto-select +0+0"
Identifier "Screen1"
Device "Device1"
Monitor "Monitor1"
DefaultDepth 24
Option "TwinView" "0"
Option "metamodes" "DFP-1: 1920x1080 +0+0; DFP-1: nvidia-auto-select +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection

Hi, did you find a solution to your problem? I am having the same problem now.