Ambient Light Sensor
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Showing up as an input is something identified as a temt6200_light.
That's probably something doing an a2d conversion of Vishay Semiconductors TEMT 6200 ambient light sensor
You can read the ambient light value from /sys/class/input/input4/result
Putting the pre in complete darkness: <source lang="text"> root@castle:/sys/class/input/input4# cat result 4 </source>
Exposing it to low light levels <source lang="text"> root@castle:/sys/class/input/input4# cat result 11 </source>