SlavikZ, thank you for commit bisecting the kernel. Could you please boot into 
a Live environment of Quantal via http://releases.ubuntu.com/quantal/ , unplug 
all USB devices, plug in just the Hercules Blog Webcam, and then immediately 
execute the following in a terminal and attach the results:
lsusb -v > lsusb-v.log

** Summary changed:

- Kernel oops when connecting web camera
+ BUG: unable to handle kernel NULL pointer dereference at 0000000000000050; 
RIP: 0010:[<ffffffffa046ada1>] [<ffffffffa046ada1>] v4l2_ctrl_g_ctrl+0x11/0x60 
[videodev]

** Tags removed: needs-bisect
** Tags added: bisect-done

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1173723

Title:
  BUG: unable to handle kernel NULL pointer dereference at
  0000000000000050; RIP: 0010:[<ffffffffa046ada1>] [<ffffffffa046ada1>]
  v4l2_ctrl_g_ctrl+0x11/0x60 [videodev]

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