I posted this question in askubuntu.com a couple of weeks ago but to no avail, so far. I hope I will have better luck in this forum!
My System: Laptop Lenovo Thinkpad T420, Ubuntu 12.04 Precise
When I installed Precise, I could use my webcam without any issue (Cheese, Skype...) However, all of a sudden (I suppose after an update) it stopped working, Cheese showing me "no device found", but stll shows up in lsusb:
However /dev/video0 does not exist...
Bus 001 Device 004: ID 04f2:b221 Chicony Electronics Co., Ltd integrated camera
I don't see how to debug this, I assume it must be easy since it used to work perfectly on this same machine and installation.
It is worth mentioning that the webcam is not damaged or disconnected as it is working flawlessly in my dual-boot windows partition. The only reason I boot on Windows now is to use Skype, since Ubuntu doesn’t allow me thus luxury...Any help would be greatly appreciated. Please let me know if you need more details.