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Help For the“too bright Screen” for ATI 5650m

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hi  i'm a chinese  

plz forgive my poor english first



i have a Sony EA18 notebook 

With the help of dsdt and fb  i made the 10.9 in my notebook and opened the QE CI  successful

and also  my notebook can change its brightness  


but  the screen is toobright at the first gear in mac ,and its nearly similar with my notebook at third gear in windows

and i found the value of PNLF brighttable is larger than a real mac


when use the intel graphic card  i can edit the AppleIntelFrambufferCapri.kext 


but i dont know wich kext i should edit  when use ati graphic card


plz help me 









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