I also have an Asus K52 with the same problem, webcam led switches on at
boot. I solved it editing the file /etc/colord.conf and changing to
"UseSANE=false".

With some applications it happens the same, when you start them the led
switches on even if the webcam is not active. This can be solved running
the application like this:

- For 64bit applications:
LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libv4l/v4l1compat.so application-command

- For 32bit applications:
LD_PRELOAD=/usr/lib/i386-linux-gnu/libv4l/v4l1compat.so application-command

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https://bugs.launchpad.net/bugs/897792

Title:
  webcam led is on when camera is not really used

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