Hope that helps:
When I want to open the webcam with vlc via terminal I usually get this message:

simon@eeerika:~$ vlc v4l2:///dev/video0
VLC media player 1.1.9 The Luggage (revision exported)
Blocked: call to unsetenv("DBUS_ACTIVATION_ADDRESS")
Blocked: call to unsetenv("DBUS_ACTIVATION_BUS_TYPE")
[0x929d92c] main libvlc: VLC wird mit dem Standard-Interface ausgeführt. 
Benutzen Sie 'cvlc', um VLC ohne Interface zu verwenden.
Blocked: call to setlocale(6, "")
Warning: call to srand(1303797074)
Warning: call to rand()
Blocked: call to setlocale(6, "")

(process:3188): Gtk-WARNING **: Locale not supported by C library.
        Using the fallback 'C' locale.
[0x963bcf4] v4l2 demux error: cannot open video device '/dev/video0' (Device or 
resource busy)
[0x963bcf4] v4l2 demux error: cannot open video device '/dev/video0' 
(Permission denied)
[0x963c414] v4l2 access error: cannot open video device '/dev/video0' (No such 
file or directory)
[0x963c414] v4l2 access error: cannot open video device '/dev/video0' (No such 
file or directory)
[0x9370cec] main input error: open of `v4l2:///dev/video0' failed: (null)

If the camera is in a good mood, it will sometimes start showing the webcam 
video output in vlc, I get the following output in the terminal:
simon@eeerika:~$ vlc v4l2:///dev/video0
VLC media player 1.1.9 The Luggage (revision exported)
Blocked: call to unsetenv("DBUS_ACTIVATION_ADDRESS")
Blocked: call to unsetenv("DBUS_ACTIVATION_BUS_TYPE")
[0x9db492c] main libvlc: VLC wird mit dem Standard-Interface ausgeführt. 
Benutzen Sie 'cvlc', um VLC ohne Interface zu verwenden.
Blocked: call to setlocale(6, "")
Warning: call to srand(1304304020)
Warning: call to rand()
Blocked: call to setlocale(6, "")

(process:2740): Gtk-WARNING **: Locale not supported by C library.
        Using the fallback 'C' locale.
[0x9e70e44] signals interface error: signal 17 overriden (0x54904c0)
[0x9e70e44] signals interface error:  /usr/lib/libQtCore.so.4(?)[(nil)]
[0x9e70e44] signals interface error: signal 17 overriden (0x54904c0)
[0x9e70e44] signals interface error:  /usr/lib/libQtCore.so.4(?)[(nil)]

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https://bugs.launchpad.net/bugs/774287

Title:
  webcam not working / eee pc 1000h & natty

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