Unfortunately I have do drop this bug report at this moment. I tried a lot of 
kernels starting from 2.6.x, going thru 3.0.0, 3.2.x, 3.5.x, 3.8.x - none of 
them really worked - most of them not even going past the boot stage. Some 
early ones got the backlight after boot but no log-in screen. Many of the later 
ones' got no backlight and freeze soon after log-in. I'm not sure I can 
pinpoint any working kernel version for bisection at this time. And time is 
something I don't have - I need a working environment so I'll be doing a clean 
install of Ubuntu 14.04 hoping it solves the problem. Sorry for wasting your 
time.
Best regards,
Michał Kozub

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

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

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