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[Li Li <li.li@xxxxxxxxxxxxx>]

Seems nobody review and merge the patch. I still see this issue now. :(

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https://bugs.launchpad.net/bugs/913793

Title:
  keyboard backlight adjust wrongly

Status in “gnome-settings-daemon” package in Ubuntu:
  Fix Committed

Bug description:
  When pressing F5/F6 to decrease keyboard backlight on Macbook Air 4,1,
  the kbd backlight suddenly become to the MAX (full) value when it's
  going to be MIN (zero).

  Expected behavior:
  Keep pressing F5, the kbd backlight should decrease until zero and the backlight applet should display an empty bar.

  Current behavior:
  Keep pressing F5, the kdb backlight decreases until zero (dark without any light), but the applet jump to a full bar - So pressing F5/F6 again would adjust the kbd backlight from maximum state (instead of minimum state).

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-8-generic 3.2.0-8.14
  ProcVersionSignature: Ubuntu 3.2.0-8.14-generic 3.2.0
  Uname: Linux 3.2.0-8-generic x86_64
  NonfreeKernelModules: wl
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.90-0ubuntu1
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: Cirrus Analog [Cirrus Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  lli5       1417 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0x90600000 irq 47'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:10134206,106b6200,00100302 HDA:80862805,80860101,00100000'
     Controls      : 25
     Simple ctrls  : 9
  Date: Mon Jan  9 07:51:30 2012
  HibernationDevice: RESUME=UUID=cc35910e-72f8-4156-85f0-acfc48012f31
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64+mac (20120108)
  MachineType: Apple Inc. MacBookAir4,1
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-8-generic root=UUID=02e7076b-bab1-4657-ae2c-d6c733869f1c ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-8-generic N/A
   linux-backports-modules-3.2.0-8-generic  N/A
   linux-firmware                           1.67
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/14/2011
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBA41.88Z.0077.B0E.1110141154
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-C08A6BB70A942AC2
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookAir4,1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-C08A6BB70A942AC2
  dmi.modalias: dmi:bvnAppleInc.:bvrMBA41.88Z.0077.B0E.1110141154:bd10/14/2011:svnAppleInc.:pnMacBookAir4,1:pvr1.0:rvnAppleInc.:rnMac-C08A6BB70A942AC2:rvrMacBookAir4,1:cvnAppleInc.:ct10:cvrMac-C08A6BB70A942AC2:
  dmi.product.name: MacBookAir4,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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