I've tested it on v4.4-wily and v4.4-rc8-wily. Same problem:
/sys/class/backlight/intel_backlight/brightness changes, but the actual
screen brightness doesn't.

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1537324

Title:
  No brightness control on Samsung NP530U4E-K01RU

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