hello everybody, As say in title I try to have a third screen with a displayLink device (USB to VGA form Konig) in order to have an extended desktop on three screens I follow those steps <a href="http://blogg.noonday.se/2010/01/28/linux-usb-video-adapter/">http://blogg.noonday.se/2010/01/28/linux-usb-video-adapter/</a> udlfb & xf86-video-displaylink are correctly installed (I used this patch to get the last working <a href="http://git.plugable.com/gitphp/index.php?p=xf-video-udlfb&a=blobdiff&h=11f2e6b9f9790d0c362a196d19419f202a40a512&hp=212e11fb358b413628acca6ffb61041b7a166d1e&hb=ace449b4d1f51e3ac94636a82ad56f80e6870ba4&f=src/displaylink.c">http://git.plugable.com/gitphp/index.php?p=xf-video-udlfb&a=blobdiff&h=11f2e6b9f9790d0c362a196d19419f202a40a512&hp=212e11fb358b413628acca6ffb61041b7a166d1e&hb=ace449b4d1f51e3ac94636a82ad56f80e6870ba4&f=src/displaylink.c</a>). I had no /etc/X11/xorg.conf so I generated one with Xorg - confgure which is Section "ServerLayout" Identifier "X.org Configured" Screen 0 "Screen0" 0 0 InputDevice "Mouse0" "CorePointer" InputDevice "Keyboard0" "CoreKeyboard" 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 "Module" Load "dbe" Load "dri" Load "dri2" Load "extmod" Load "record" Load "glx" EndSection Section "InputDevice" Identifier "Keyboard0" Driver "kbd" EndSection Section "InputDevice" Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/input/mice" Option "ZAxisMapping" "4 5 6 7" EndSection Section "Monitor" Identifier "Monitor0" VendorName "Monitor Vendor" ModelName "Monitor Model" EndSection Section "Device" ### Available Driver options are:- ### Values: : integer, <f>: float, <bool>: "True"/"False", ### <string>: "String", <freq>: "<f> Hz/kHz/MHz", ### <percent>: "<f>%" ### [arg]: arg optional #Option "SWcursor" # [<bool>] #Option "HWcursor" # [<bool>] #Option "NoAccel" # [<bool>] #Option "ShadowFB" # [<bool>] #Option "VideoKey" # Identifier "Card0" Driver "nouveau" BusID "PCI:1:0:0" 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 I tried to adapt with what i Read like this Section "ServerLayout" Identifier "X.org Configured" Screen 0 "Screen0" 0 0 Screen 1 "Screen0" LeftOf "DisplayLinkScreen" Option "Xinerama" "off" 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 "Module" Load "dbe" Load "dri" Load "dri2" Load "extmod" Load "record" Load "glx" EndSection Section "Monitor" Identifier "Monitor0" VendorName "Monitor Vendor" ModelName "Monitor Model" EndSection Section "Device" ### Available Driver options are:- ### Values: : integer, <f>: float, <bool>: "True"/"False", ### <string>: "String", <freq>: "<f> Hz/kHz/MHz", ### <percent>: "<f>%" ### [arg]: arg optional #Option "SWcursor" # [<bool>] #Option "HWcursor" # [<bool>] #Option "NoAccel" # [<bool>] #Option "ShadowFB" # [<bool>] #Option "VideoKey" # Identifier "Card0" Driver "nouveau" BusID "PCI:1:0:0" 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 ################################################# Section "Files" ModulePath "/usr/lib/xorg/modules" ModulePath "/usr/local/lib/xorg/modules" ModulePath "/usr/local/lib/xorg/modules/drivers" 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 16 Modes "1024x768" EndSubSection EndSection I have a green screen on the screen connected to the displayLink device, but no third screen for my extended desktop Have you any suggestion in which way I shoud search? Can I know if my device is supported? Thanks for your suggestions regards (and sorry for my bad english)