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[Will Cooke <1348550@xxxxxxxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1308674 ***
    https://bugs.launchpad.net/bugs/1308674

** This bug has been marked a duplicate of bug 1308674
   [Lenovo ThinkPad X220] kernel 3.13 i915 brightness settings broken when going from docked -> undocked

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https://bugs.launchpad.net/bugs/1348550

Title:
  When undocking the laptop panel brightness goes to minimum and cannot
  be increased

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  My X220 sits on a docking station connected to (among other things) an
  external DisplayPort monitor.  I have it set up so that I use both
  monitors.

  When I undock the laptop, and so remove the external display, the
  laptop panel brightness goes to minimum and cannot be made brighter
  either via the function keys or the system settings slider.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.57
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  will       2179 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Jul 25 10:15:40 2014
  HibernationDevice: RESUME=UUID=48c1ab97-c081-4af0-a42d-2ffe656eed00
  InstallationDate: Installed on 2013-12-24 (212 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: LENOVO 4287CTO
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=3238572a-b1a6-4e68-aade-1c58b750f578 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-19 (96 days ago)
  dmi.bios.date: 07/07/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET50WW (1.20 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4287CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8DET50WW(1.20):bd07/07/2011:svnLENOVO:pn4287CTO:pvrThinkPadX220:rvnLENOVO:rn4287CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4287CTO
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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