I've got Ubuntu 12.04 running on my lenovo X230. I can't get the integrated webcam working with Google Talk plugin or with Cheese.
It seems your system is not loading the driver responsible to communicate with the webcam. Try executing this in one terminal
This should provide no output. If you get any error post it in the comments. Then try to use the webcam (with Cheese, by example).
If this solves your problem, you should add