Fixed following Arch-Wiki.

Details in: 
https://nisheetlall.wordpress.com/2016/07/12/solved-brightness-fix-in-linux-1for-optimus-laptops/

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https://bugs.launchpad.net/bugs/1255428

Title:
  8086:0116 [Lenovo IdeaPad Z570] LCD brightness control keys and widget
  do not work on Intel Graphics

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