Neale Upstone, to clarify the Bug Description:
>"With default boot parameters, I just get 
>/sys/class/backlight/intel_backlight/, and the backlight works correctly on 
>3.13, but does not change the brightness on 3.16"

Is this when you were using the same nvidia driver version for both
tests?

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

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https://bugs.launchpad.net/bugs/1516370

Title:
  Vendor backlight on Lenovo Z580 having random hotkeys issues

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