V4l2 seems to have bugs..... my ov511 webcam, which used to work great, is now having problems, after the v4l2 drivers update.
The usb system becomes unstable when the ov511 is loaded. gyro mouse and gyration remote hangs short after the system is ready, router reloads from itself, unplugging and plugging back the webcam does not work....
Starting the system without the webcam (unplugged) works and no problem with other usb peripherals.