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[Michał Kozub <lachim.buzok@xxxxxxxxx>]

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

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  There is no backlight on my Asus X52Je notebook after boot. It works
  fine at the grub stage and splash sreen but afterwards it just goes
  black (though you can barely see something - that's why i could turn
  on the monitor clone option and use a secondary display). Function
  keys work and there is an entrance in /sys/class/backlight/ - it just
  doesn't do anything. I've had this problem since 12.04 - i think it
  started after one of the software updates. It did work for quite some
  time before. I'm now at 14.04 and all the versions up to this point
  had the same problem (12.10, 13.04, 13.10).

  Also tried some common workarounds, like:
  acpi_backlight=vendor
  acpi_osi=Linux
  acpi=off
  video.use_bios_initial_backlight=0
  video.use_native_backlight=1

  The attachements have the required diagnostic files.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic i686
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  drink      2012 F.... pulseaudio
   /dev/snd/controlC0:  drink      2012 F.... pulseaudio
   /dev/snd/pcmC0D0p:   drink      2012 F...m pulseaudio
  CurrentDesktop: Unity
  Date: Sat May  3 17:37:38 2014
  HibernationDevice: RESUME=UUID=517b6655-6f63-483f-80c0-087e4799c881
  MachineType: ASUSTeK Computer Inc. K52Je
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=da0531fa-9dbd-4f69-9179-0dd5b2740f22 ro video.use_native_backlight=1
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127.1
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-24 (9 days ago)
  dmi.bios.date: 01/26/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: K52Je.212
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: K52Je
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrK52Je.212:bd01/26/2011:svnASUSTeKComputerInc.:pnK52Je:pvr1.0:rvnASUSTeKComputerInc.:rnK52Je:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: K52Je
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.

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