[Libdlo] 3rd screen with displaylink and nvidia driver on ubuntu 10.10

[Vincent MAZENOD]

I tried to configure a third screen connected with a displaylink (Konig 
USB VGA) on an ubuntu 10.10 Maverick Meerkat
First I installed nvidia proprietary driver
Next I followed these instructions 
http://ubuntuforums.org/showthread.php?p=9358565 to install displaylink 
driver libdlo (except for the update of the kernel cause I've already a 
newer one)
Next when I reboot I have the prompt connexion on the screen connected 
with displaylink and an extended desktop on my 3 screens \o/
BUT when I log in gdm crash  immediatly!

I found this line in /var/log/syslog

Dec  2 12:40:47 bigmaze NetworkManager[1121]: <error> 
[1291290047.969035] [nm-manager.c:1317] user_proxy_init(): could not 
init user settings proxy: (3) Could not get owner of name 
'org.freedesktop.NetworkManagerUserSettings': no such name

and googling say I have to disable Xinerama but is not enable in my 
/etc/x11/xorg.conf as you can see

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 260.19.06  (buildd at palmer)  Mon Oct  4 
16:01:38 UTC 2010

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "DisplayLinkScreen"  0 0
    Screen      1  "Screen0" RightOf "DisplayLinkScreen"
    Option         "Xinerama" "0"
EndSection

Section "Files"
            ModulePath      "/usr/local/lib/xorg/modules/drivers"
            ModulePath      "/usr/lib/xorg/modules"
            ModulePath      "/usr/lib/xorg/modules/drivers"
            ModulePath      "/usr/local/lib"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Hitachi/HINT X220W D-sub"
    HorizSync       31.0 - 83.0
    VertRefresh     56.0 - 76.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 9500 GT"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "1"
    Option         "TwinViewXineramaInfoOrder" "CRT-0"
    Option         "metamodes" "CRT-0: nvidia-auto-select +0+0, CRT-1: 
nvidia-auto-select +1680+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

##################################################{DisplayLink
        Section "Monitor"
            Identifier     "DisplayLinkMonitor"
        EndSection
        Section "Device"
            Identifier  "DisplayLinkDevice"
            Driver        "displaylink"
            Option      "fbdev" "/dev/fb0"
        EndSection
        Section "Screen"
            Identifier      "DisplayLinkScreen"
            Device          "DisplayLinkDevice"
            Monitor         "DisplayLinkMonitor"
            SubSection "Display"
                Depth       16
                Modes       "1024x768" "800x600" "640x480"
            EndSubSection
        EndSection
        ##################################################{

I suspected a conflict between nvidia and displaylink driver cause 
using  default or nv driver is not crashing gdm (but I have not extended 
desktop with it).
So I tried to install latest version of the nvidia driver from here 
http://www.nvidia.com/object/unix.html

but gdm is still crashing a few seconds after I log in :'(

Any suggestion?

regards


Vincent