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[Clint Byrum <clint@xxxxxxxxxx>]

I just booted with acpi_backlight=vendor and that solves the issue.
Happy to help debug the issue to help other users of this hardware avoid
the problem.

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https://bugs.launchpad.net/bugs/1309584

Title:
  Backlight does not work on intel driver after upgrade from 13.10 ->
  14.04, acpi_backlight=vendor solves

Status in “linux” package in Ubuntu:
  New

Bug description:
  I am running on an HP EliteBook Folio 9470m which has an i915 video
  chipset.

  After upgrading to 14.04, the backlight and brightness controls do not
  work on the laptop screen.

  $ sudo intel_backlight 
  current backlight value: 4%

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3
  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: Fri Apr 18 08:02:05 2014
  DistUpgraded: 2014-04-18 01:03:05,027 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus: openvswitch, 2.0.1+git20140120: added
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:18df]
  InstallationDate: Installed on 2013-01-14 (459 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64+mac (20121017.3)
  MachineType: Hewlett-Packard HP EliteBook Folio 9470m
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=/dev/mapper/ubuntu-root ro quiet splash "acpi_osi=!Windows 2012" vt.handoff=7
  SourcePackage: xserver-xorg-video-intel
  UpgradeStatus: Upgraded to trusty on 2014-04-18 (0 days ago)
  dmi.bios.date: 09/24/2012
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68IBD Ver. F.30
  dmi.board.name: 18DF
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 62.13
  dmi.chassis.asset.tag: CNU2439PZT
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68IBDVer.F.30:bd09/24/2012:svnHewlett-Packard:pnHPEliteBookFolio9470m:pvrA1029D1103:rvnHewlett-Packard:rn18DF:rvrKBCVersion62.13:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook Folio 9470m
  dmi.product.version: A1029D1103
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  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
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Fri Apr 18 01:04:29 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                5239 
   vendor                                     CMN
  xserver.version: 2:1.15.1-0ubuntu2

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