Logitech Webcam locks Logitech Illuminated Keyboard

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https://bbs.archlinux.org – since a few months I've got this problem:Today I just wanted to skype a lil' bit with my friend in Zürich. Suddenly my keyboard stopped working. I managed to get it working again just by plug it in again.The problem appears only when I start my webcam. For example over skype. I've got also my microphone over the webcam, but that works fine in skype so far and doesn't block my keyboard. But when I start the webcam, after few seconds my keyboard stops working.I thought it could be a problem with the usb plugging. so I tried plugging the webcam over a USB-Hub or both, keyboar (HowTos)