This did the trick for me:
echo 0 > /sys/bus/usb/devices/1-1.6/power/autosuspend_delay_ms

You can find the device ID (my 1-1.6) like this:
grep -i camera -R /sys/bus/usb/devices/*/product
/sys/bus/usb/devices/1-1.6/product:Integrated Camera

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https://bugs.launchpad.net/bugs/276791

Title:
  Powertop reports a USB device is active 100% of the time.

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