Danato, your reverse mainline kernel version testing was quite helpful in 
finding potential commits that fixed this problem. One that stands out is:
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-3.12.y&id=76641adddc5dc634cb7759dfa95d3d5a545678d1

I'm struggling to easily download the 3.12 branch to compile it, so I'll
mark this Triaged for now until either I figure it out, or the fix is
released into a Ubuntu kernel.

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

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Title:
  [Lenovo G780] Backlight switched off at login screen

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