xorg - DisplayLink usb on ubuntu 12.04 on laptop

I'd like to use a displaylink usb UGA-2k-A rev b. (dl-195) on my laptop with ubuntu 12.04
I have an Asus x53s with intel graphics and nvidia Geforce GT 520MX 1GB.
I've read a lot of posts about how to config, but my problem still persist.

I've installed the xserver-xorg-displaylink driver.
The monitor goes green, but I still have problem with my xorg.conf
This is my last try.

Section "ServerLayout"
    Identifier     "X.org Configured"
    Screen      0  "DisplayLinkScreen" 1280 0
    Screen      1  "Screen0" RightOf "DisplayLinkScreen"
        Option         "Xinerama" "off" 
EndSection
Section "ServerFlags"
    Option       "RandR" "on"
EndSection


Section "Files"
    ModulePath   "/usr/lib/xorg/modules"
    FontPath     "/usr/share/fonts/X11/misc"
    FontPath     "/usr/share/fonts/X11/cyrillic"
    FontPath     "/usr/share/fonts/X11/100dpi/:unscaled"
    FontPath     "/usr/share/fonts/X11/75dpi/:unscaled"
    FontPath     "/usr/share/fonts/X11/Type1"
    FontPath     "/usr/share/fonts/X11/100dpi"
    FontPath     "/usr/share/fonts/X11/75dpi"

    FontPath     "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
    FontPath     "built-ins"
EndSection

Section "Monitor"
Identifier   "Monitor0"
VendorName   "Monitor Vendor"
ModelName    "Monitor Model"
EndSection


Section "Device"
Identifier  "Card0"
Driver      "intel"
BusID       "PCI:0:2:0"
EndSection

Section "Screen"
Identifier "Screen0"
Device     "Card0"
Monitor    "Monitor0"

SubSection "Display"
    Viewport   0 0
    Depth     1
EndSubSection
SubSection "Display"
    Viewport   0 0
    Depth     4
EndSubSection
SubSection "Display"
    Viewport   0 0

    Depth     8
EndSubSection
SubSection "Display"
    Viewport   0 0
    Depth     15
EndSubSection
SubSection "Display"
    Viewport   0 0
    Depth     16
EndSubSection

SubSection "Display"
    Viewport   0 0
    Depth     24
EndSubSection
EndSection

############### DisplayLink Stuff ###############                                                                 

Section "Device"
    Identifier      "DisplayLinkDevice"

    driver          "displaylink"
    Option  "fbdev" "/dev/fb1"
EndSection

Section "Monitor"
    Identifier      "DisplayLinkMonitor"
EndSection

Section "Screen"
    Identifier      "DisplayLinkScreen"

Device          "DisplayLinkDevice"
    Monitor         "DisplayLinkMonitor"
   # SubSection "Display"
   #         Depth   24
   #        Modes   "1280x1024"
   # EndSubSection
EndSection

And this is the result...https://docs.google.com/file/d/0ByBQOgnmD50pcS1PYTZ1WlJCSGc/edit?usp=sharing

Where is my fault?
Thanks in advance