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I had the same problem and solved it as follow:

sudo rmmod uvcvideo
sudo modprobe uvcvideo quirks=128

After doing that, I can acquire images from 2 cameras at the same time. Credits: http://renoirsrants.blogspot.com/2011/07/multiple-webcams-on-zoneminder.html. Checkout this link to see how to add this to your module conf so that changes become permanent.

However, using OpenCV to acquire images from the webcam still does not work. But using the usb_cam pkg, everything is fine.