*** This bug is a duplicate of bug 290506 ***
    https://bugs.launchpad.net/bugs/290506
I think the dupe status is wrong. I've got an Acer 4720 with a Crystal
Eye webcam and no apps is working with it. If I start video apps through
the console I hace the same line:

Skype:

libv4l2: error turning on stream: Error de protocolo
Skype V4L2: Failed to activate streaming

Cheese:

libv4l2: error turning on stream: Error de protocolo

(cheese:6736): GStreamer-CRITICAL **: gst_element_set_state: assertion
`GST_IS_ELEMENT (element)' failed

(cheese:6736): GStreamer-CRITICAL **: gst_object_unref: assertion
`object != NULL' failed

(cheese:6736): GStreamer-CRITICAL **: gst_object_unref: assertion
`object != NULL' failed


ekiga:

libv4l2: error requesting 4 buffers: Dispositivo ó recurso ocupado
libv4l2: error requesting 4 buffers: Dispositivo ó recurso ocupado
libv4l2: error requesting 4 buffers: Dispositivo ó recurso ocupado
libv4l2: error requesting 4 buffers: Dispositivo ó recurso ocupado
libv4l2: error requesting 4 buffers: Dispositivo ó recurso ocupado
libv4l2: error requesting 4 buffers: Dispositivo ó recurso ocupado
libv4l2: error requesting 4 buffers: Dispositivo ó recurso ocupado
libv4l2: error requesting 4 buffers: Dispositivo ó recurso ocupado
libv4l2: error requesting 4 buffers: Dispositivo ó recurso ocupado

-- 
Acer Crystal Eye webcam does not work
https://bugs.launchpad.net/bugs/205970
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