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[Launchpad Bug Tracker <1399900@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: unity (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1399900

Title:
  screen brightness cannot be changed anymore

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  The screen brightness does not reliably respond to adjustments anymore since 14.10 release. 
  Previously in 14.04 it was adjustable via a slider in Ubuntu Control Center and via the keyboard buttons (so there is driver and keyboard support for this laptop). 
  Now the keyboard buttons as well as the slider have no effect and the brightness defaults to 100% which is on this device about five times brighter than the comfortable level, and strains the battery.

  However about 1 in 20 bootups/logins, the brightness is adjustable,
  but when I logout/login again in the user session, it might again
  become locked to 100%. I have the suspicion that it depends on the
  loading of desktop configs or the time I wait before typing my
  password to login.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: unity 7.3.1+14.10.20141016-0ubuntu1
  ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
  Uname: Linux 3.16.0-25-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sat Dec  6 12:20:50 2014
  DistUpgraded: 2014-11-04 18:35:56,188 DEBUG enabling apt cron job
  DistroCodename: utopic
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 4.3.18, 3.16.0-24-generic, x86_64: installed
   virtualbox, 4.3.18, 3.16.0-25-generic, x86_64: installed
  EcryptfsInUse: Yes
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:3978]
  InstallationDate: Installed on 2014-02-02 (306 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140201)
  MachineType: LENOVO 20266
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic.efi.signed root=UUID=4bfb3686-b9f7-487d-81f6-eceb41097ad9 ro quiet splash acpi_backlight=vendor vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: Upgraded to utopic on 2014-11-04 (31 days ago)
  XorgConf:
   
  dmi.bios.date: 10/31/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 76CN31WW
  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:bvr76CN31WW:bd10/31/2013: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 1:0.9.12+14.10.20140918-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.0-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.0-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
  xserver.bootTime: Sat Dec  6 12:19:59 2014
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               16970 
   vendor                                     SDC
  xserver.version: 2:1.16.0-1ubuntu1

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