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[Michał Kozub <lachim.buzok@xxxxxxxxx>]

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

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

Title:
  Backlight not working after boot

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  As the summary states: 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 tried
  upgrading Ubuntu in hope that that would fix it, but to no avail - I'm
  now at 14.04 and all the versions up to this point had the same
  problem (12.10, 13.04, 13.10). I also tried latest mainline kernel but
  that didn't help.

  Also tried some common workarounds, like:
  'acpi_backlight=vendor'
  'acpi_osi=Linux'
  'acpi=off'
  And the like, also with no effect.

  Also updated BIOS to latest version form manufacturer - didn't help.

  The attachements have the required diagnostic files.

  Thanks,
  mk

  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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