[ubuntu] webcam not usable after wake-up

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http://ubuntuforums.org – Here is the problem : I have a Logitech webcame which is working fine with my ubuntu machine, the only problem is that every time I turn my laptop to sleep and wake it up again, the webcam doesn't work any more. I usually do not turn off my laptop so when I sleep I get it to sleep as well. And then after a few days when I want to use my webcam to make a video chat with my family I have to restart my laptop. This is pretty annoying because I have to save a lot of documents first in order to restart safely. Does any body else encounter the same problem as I do? (Hardware)