Brightness Issue

when macbook (lion, 10.7.3) connected mains power supply , connected external monitor via mini-display port dvi macbook in clamshell mode. if shut down , power macbook on no power supply or other cables connected, brightness @ 100% , have turn down manually. doesn’t occur if using macbook connected mains , disconnect power, brightness goes down should do, occurs in clamshell mode. have reset smc , pram. it’s minor issue annoying!

 

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