Seems I needed to adjust the correction_factor gconf key in gnome-power-
manager - in good light, the light sensor would be

cat /sys/devices/platform/applesmc.768/light 
(4,0)

and then covering it with my hand, I'd get

cat /sys/devices/platform/applesmc.768/light
(0,0)

So it seems to be reading quite low, changing correction_factor to 10000 seems 
to give some appropriate results... I am a little concerned about the 0 reading 
from the right sensor though - is this something specific to the applesmc 
driver on MBP 5,1 or is it more indicative of some hardware
fault??

-- 
Backlight keeps getting darker on MacBookPro
https://bugs.launchpad.net/bugs/285815
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