I have the late 2013 version of the Macbook Air, I don't know how the ambient light sensor should behave, I think the keyboard light should automatically led up when the ambient light is too low, and ...
I just replaced the screen of my macbook air and now the backlight does not work. When I turn on the laptop, the screen works but the backlight does not turn on. I've tested with a couple of screens ...
I have a 2011 Macbook Air and I find that the ambient light sensor does a great job of setting an appropriate backlight brightness level. It's particularly good at not blinding you when you open up ...