Alan Pope pointed out that probably the reason that the camera key
removes the camera so effectively (that is: it doesn't just disable it,
it totally removes it as though it were never there at all; the thing
drops off the bus, which is presumably happening at some sort of
hardware level, rather than the kernel doing it? Joseph can you confirm
that it's a hardware thing?) is that then malicious applications can't
surreptitiously turn on the camera. I appreciate that this is the case.
It would be really nice if, for example, we could detect the difference
between "the camera on this machine is disabled in this way" and "this
machine really doesn't have a camera"... and then alert the user
somehow, so they don't go through the baffling mystery that I did.
(Imagine, for example, if we provided a video source which was a JPG
saying "your camera is disabled: press the camera button to re-enable
it". No-one would ever be baffled again.)

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https://bugs.launchpad.net/bugs/1163268

Title:
  Lenovo U300s webcam stopped working, somewhere around mid-March 2013

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