mbp 13 late 2013 auto brightness not working

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hi guys,

discovered auto brightness not working anymore while using laptop during night , brightness failed adjust , bright.

i've tried ticking , unpicking auto brightness checkbox , restarting.
problem still there.

sure working fine on mavericks, might have been yosemite update.

guys?
 

try pram reset: command+option+p+r on boot (before chime). hold down key combination, until mac chimes 3rd time, release keys , allow system boot.
 


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