Ubuntu
linux package

  1. Bug #897792
  2. Comment #10

Comment 10 for bug 897792

Revision history for this message
In , Tobi (tobi-redhat-bugs) wrote :

Another thing I now figured out, which might be useful:

It occurred to me that maybe the LED would be turned on by an USB device scan or so. So I tried this using lsusb, and indeed running lsusb turns on the webcam LED!

So I tried to narrow this down a little more using strace on lsusb, and finally came to the conclusion that apparently opening the device of the camera (/dev/bus/usb/001/002) switches the LED on.

E.g. `dd if=/dev/bus/usb/001/002 of=/dev/null count=0' is sufficient to switch the LED on. As I expected, when opening other USB devices this does not influence the LED status at all.

At this moment I do not know how to look further, but to me it seems clear that just opening the device file triggers something somewhere that turns on the webcam/LED.