I've found a solution for my case after a few days of despair.

It consists in using these options in /etc/default/grub:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux
acpi_backlight=video"

I have a Samsung laptop model NP470R4E running Ubuntu 16.10.

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https://bugs.launchpad.net/bugs/1380824

Title:
  Backlight not working on Samsung ATIV 8 laptop

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