Keyboard light auto brightness revert behavior

     I know that older versions of OS X has the behavior that the keyboard backlight is dimmer in brighter environments, but with Yosemite it is obviously the other way around (it gets brighter when environment gets brighter).
     I know Apple must have had a very good reason to revert the behavior, but most usually this reverse behavior only causes me to manually hit F5 for many times to turn off the backlight when daylight comes, and hit F6 for one or two times to turn it back on when night falls. So now I can even be better off with this (reversed) auto backlight feature turned off.
     So I desperately hope that Apple could give users an option to reverse the keyboard backlight behavior. I know there have been discussions on this yet I can't manage to find a solution.
     In the mean time before Apple decides to give users the choice, a temporary solution for this (things like modifying some system configuration files) could really come in handy!

Hey XavierXing, 
That is interesting that your backlit keyboard is getting brighter with the ambient light getting brighter. I would start with resetting the SMC as that should correct any irregular behavior. Let me know if this helps or need further assistance. 
Resetting the System Management Controller (SMC) on your Mac
https://support.apple.com/en-us/HT201295
Take care,
-Norm G. 

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