Michał Kozub, could you please test the latest mainline kernel via
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.15-rc5-utopic/ and
advise to the results?

If reproducible, could you please comment to using any of the following kernel 
parameters individually (not in combination):
video.use_bios_initial_backlight=0
video.use_native_backlight=1

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

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https://bugs.launchpad.net/bugs/1315697

Title:
  1002:68e0 [Asus K52Je] Backlight not working after boot

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