Comment 69 for bug 22070

And I'm assuming the two Lucid ones are running different graphics chipsets? Hence we can dismiss the graphics theory?

Okay, I have a new kernel for you to try. It won't make your camera work, but it will provide lots of debug which I want you to send to me. Remove your camera, dpgk the kernel in and boot into it. On reboot, plug your camera in and try to test your camera with Ekigna. See what happens and load up your /var/log/messages and /var/log/kern.log files when you've finished.

The kernel is available here:
  http://people.canonical.com/~ljones/lp22070-lucid/