I have the same issue at HP EliteBook 8560w and Linux 3.19.0-30-generic
#34~14.04.1-Ubuntu SMP Fri Oct 2 22:09:39 UTC 2015 x86_64 x86_64 x86_64
GNU/Linux and GNOME Shell 3.10.4

I've started with Ubuntu 14.04 so brightness controls never worked here
with Ubuntu. But I also have Windows 7 (as multiboot) and brightness
tunes ok with it.

How can I help to resolve this issue?

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

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https://bugs.launchpad.net/bugs/1349002

Title:
  Screen brightness cannot be changed on HP EliteBook 8560w

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