kernel-bug-exists-upstream-3.18-rc3 -- the aforementioned
/usr/share/X11/xorg.conf.d/80-backlight.conf

with the contents:

Section "Device"
    Identifier "Intel Graphics"
    Driver "intel"
    Option "AccelMethod" "sna"
    Option "Backlight" "intel_backlight" # use your backlight that works here
    BusID "PCI:0:2:0"
EndSection

continues to work to workaround it.

** Tags added: kernel-bug-exists-upstream-3.18-rc3

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https://bugs.launchpad.net/bugs/1388636

Title:
  [Lenovo V570 Notebook] Brightness not changing via UI widget in GNOME
  shell or hotkeys

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