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https://bugs.launchpad.net/bugs/1392016

Title:
  [Asus UL30VT] Backlight control does not work

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  The backlight control on my Asus UL30VT has not worked for quite a
  while. It used to work, a few ubuntu versions ago. The backlight
  control bubble does show up when the function keys on the laptop are
  pressed.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-39-generic 3.13.0-39.66
  ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
  Uname: Linux 3.13.0-39-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  lina       2081 F.... pulseaudio
   /dev/snd/controlC0:  lina       2081 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Nov 12 20:20:31 2014
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=c8002bb0-2b05-4952-bc8b-bfcd29ac6117
  InstallationDate: Installed on 2013-02-26 (623 days ago)
  InstallationMedia: This
  MachineType: ASUSTeK Computer Inc. UL30VT
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-39-generic root=UUID=ff44dc17-e11a-4d44-8ab6-bf188f64ed83 ro quiet splash acpi_backlight=vendor vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-39-generic N/A
   linux-backports-modules-3.13.0-39-generic  N/A
   linux-firmware                             1.127.8
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-07-20 (115 days ago)
  dmi.bios.date: 07/14/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 211
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UL30VT
  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.:bvr211:bd07/14/2010:svnASUSTeKComputerInc.:pnUL30VT:pvr1.0:rvnASUSTeKComputerInc.:rnUL30VT:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: UL30VT
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.

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