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[sucipto <show.cheap@xxxxxxxxx>]

Same issue here, 
Asus X45A

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https://bugs.launchpad.net/bugs/1397517

Title:
  Unity Screen Brightness Settings not Preserved on Reboot

Status in Unity:
  Invalid
Status in gnome-power-manager package in Ubuntu:
  Confirmed
Status in unity package in Ubuntu:
  Invalid

Bug description:
  Whenever Unity starts it sets the screen brightness to maximum, even
  when the laptop is on battery. Lowering the screen brightness doesn't
  persist across reboots.

  To reproduce:
  1. Start laptop (in this case a Lenovo Yoga 2 Pro) in battery mode (i.e. disconnected from the AC adaptor)
  2. Unity will start in maximum brightness. Lower brightness using keyboard brightness keys.
  3. Shutdown laptop and start it back up again (still with the AC adapter disconnected)

  Expected result:
  The screen brightness settings should be preserved across reboots

  Actual result:
  After each new start Unity sets the screen brightness to maximum, meaning the user has to remember to manually reduce it or the battery will be quickly used up

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.2.3+14.04.20140826-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
  Uname: Linux 3.13.0-40-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,imgpng,mousepoll,vpswitch,unitymtgrabhandles,gnomecompat,regex,move,grid,place,wall,animation,snap,resize,fade,session,expo,workarounds,scale,ezoom,unityshell]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sat Nov 29 11:59:31 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:3978]
  InstallationDate: Installed on 2014-09-16 (73 days ago)
  InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  MachineType: LENOVO 20266
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-40-generic.efi.signed root=/dev/mapper/MainVG-root ro video.use_native_backlight=1 quiet splash vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/25/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 76CN35WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Yoga2
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058STD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Yoga 2 Pro
  dmi.modalias: dmi:bvnLENOVO:bvr76CN35WW:bd03/25/2014:svnLENOVO:pn20266:pvrLenovoYoga2Pro:rvnLENOVO:rnYoga2:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoYoga2Pro:
  dmi.product.name: 20266
  dmi.product.version: Lenovo Yoga 2 Pro
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.2
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.3
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Fri Nov 28 23:10:38 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               16970 
   vendor                                     SDC
  xserver.version: 2:1.15.1-0ubuntu2.1

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