I've got a Dell Latitude E6410 notebook which changes lcd light intensity in response to ambient light levels, so it has to have some photocell. How can I access the data from this photocell? I tried different google searches like lux meter, light intensity monitor and so on and did not find a single right thing.
On this laptop (a MacBookPro), it reveals (among other things):
which is neither over PCI or USB.
You could try the same after
which are drivers for various ambient light sensors.
You could also try
A few links:
I do not know what the ALS is in your particular case, but as @January said, you may start from the