It started happening when I switched to Gnome. At first I had both Gnome and 
Unity next to each other and when I logged in to Unity, I could still change 
the backlight normally.
It only doesn't work under Gnome strangely.

I've tested the new kernel, but it had no effect:
Linux 4.8.0-040800rc6-generic #201609121119 SMP Mon Sep 12 15:21:03 UTC 2016 
x86_64 x86_64 x86_64 GNU/Linux

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

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

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  Changing backlight doesn't work in Gnome

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