QGis Globe runs on a GeoWall using ubuntu natty

After a day of work in the GeoWall lab at the GIScience Center of the Zurich University, I got QGis Globe to work in QuadBuffer stereo mode with polarization glasses.
The hardware used is a Dell Precision 390 workstation with a NVIDIA Quadro® FX 3500 Graphic card and two projectors mounted on a special rack with polarizing lenses.
The software on the software side, the mutex-globe branch was installed on an Ubuntu natty, using the classic (no effects) desktop since stereo cannot be used with the X composite extension. The graphic driver is the 270.41.06 coming from the restricted driver in Ubuntu. The modification I had to do to the /etc/xorg.conf generated from nvidia-settings file where the addition of:
Section "Extensions"
Option "Composite" "off"
EndSection
and within the Section „Device“:
Option "Stereo" "4"
Here the file for reference:# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 270.29 (buildd@roseapple) Fri Feb 25 14:43:24 UTC 2011
#
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "0"
EndSection
#
Section "Files"
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 "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
#
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Projectiondesign AS"
HorizSync 30.0 - 140.0
VertRefresh 48.0 - 110.0
Option "DPMS"
EndSection
#
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "Quadro FX 3500"
Option "Stereo" "4"
EndSection
#
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "TwinView" "1"
Option "TwinViewXineramaInfoOrder" "DFP-0"
Option "metamodes" "DFP-0: nvidia-auto-select +0+0, DFP-1: nvidia-auto-select +0+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection
#
Section "Extensions"
Option "Composite" "off"
EndSection