Auto Brightness control

This may be obvious, but no one seems to have mentioned it yet...  My
quickcam seems to find an appropriate light level when I set
brightness to 255.  Skimming over the xfqcam source, I don't get the
impression this is done by xfqcam...  Did I just figure out what
everyone else figured out in the first five minutes of playing with
their quickcam?  Is my headache worse than I thought? ;)