DisplayLink

From BCCD 3.0

1. Plug in the monitor.
2. Run dmesg|grep "udlfb: DisplayLink USB device". You should see a line like this: <verbatim> udlfb: DisplayLink USB device /dev/fb1 attached. 1366x768 resolution. Using 4104K framebuffer memory </verbatim>
3. The UNIX device /dev/fb1 is the device to which the monitor is attached (it might be something different for you).
4. Add this to the bottom of /etc/X11/xorg.conf:

   ################ DisplayLink ###################
   Section "Device"
   Identifier      "DisplayLinkDevice"
   Driver          "fbdev" 
   BusID           "USB"               # needed to use multiple DisplayLink devices 
   Option          "fbdev" "/dev/fb1"  # change to whatever device you want to use
   #      Option          "rotate" "CCW"      # uncomment for rotation
   EndSection
   
   Section "Monitor"
   Identifier      "DisplayLinkMonitor"
   EndSection
   
   Section "Screen"
   Identifier      "DisplayLinkScreen"
   Device          "DisplayLinkDevice"
   Monitor         "DisplayLinkMonitor"
   DefaultDepth    16
   EndSection
   

5. Edit the ServerLayout section of xorg.conf to contain this:

       Screen "DisplayLinkScreen"
       Option "Xinerama" "on"
   

6. Remove the Default Screen section