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I have a virtual machine running Ubuntu 10.04 32-bit. Using the tools provided with VirtualBox, I have added a DisplayLink device to the VM and created the following xorg.conf file:

Section "ServerLayout"
        Identifier      "Server Layout"
        Screen  0       "DisplayLinkScreen" 0 0
        Option          "Xinerama" "off"
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   "800x480"
        EndSubSection
EndSection

This works to a small degree - the DisplayLink device turns green, and eventually a purple desktop with my icons appear on it. The actual VBox window is blank. The problem is that:

  • the Gnome panel does not load
  • a right-click on the desktop has no effect

I tried pressing Alt+F1 and the console displays in the VBox window. Pressing Alt+F7 after that does nothing. I have to press Alt+F8 to get back to the GUI. This leads me to believe that there's an extra display in there somewhere.

I have installed Guest Additions if that helps. GDM is set to auto-login to a Gnome session.


Edit: It seems like the problem is with Gnome / GDM. Applications (e.g. gnome-terminal) display normally. xev is reporting that all input events are coming through okay. The panel seems to be partially running but invisible:

$ wmctrl -Gl | grep -i panel
0x01200003 -1 0      0     1     1   test-pc Top Expanded Edge Panel
0x01200042 -1 0      0     1     1   test-pc Top Expanded Edge Panel
share|improve this question
    
See a troubleshooting session in chat. My conclusion is that everything is ok on the X front, and Gnome is acting weird. –  Gilles Apr 4 '11 at 19:30
    
@Gilles: Thanks so much for your help! –  Nathan Osman Apr 4 '11 at 19:59

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