Ambient Light Sensor Not Working Macbook Pro 13 inch early 2011 version

Hi. I just need some clarification on how the ambient light sensor works. it seems mine is not working. Correct me if I'm wrong:
1. Screen light must increase brightness if you are in a dark / dim room
2. Screen light must decrease brightness if there is natural light
What must be the level of light in F2? Should it just be in the middle to activate ALS?
Am I correct or not?

1. Screen light must increase brightness if you are in a dark / dim room
2. Screen light must decrease brightness if there is natural light
Actually, you are wrong. The opposite of each statement is true.
If the screen adjusted itself to maximum brightness in a very dark room, it would be blinding. In a dark room, you only need a very dim backlight to be able to see the screen well.
And in bright light, the screen is quite hard to read unless it is very bright.
What must be the level of light in F2? Should it just be in the middle to activate ALS?
I'm sorry, but I don't understand these questions.
The ALS is always active. You can determine (in System Preferences) whether or not it will automatically adjust your keyboard and display backlights as ambient light levels change.

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