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[Launchpad Bug Tracker <1377120@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1377120

Title:
  [Lenovo ThinkPad X220] Undocking notebook results in minimum
  brightness

Status in linux package in Ubuntu:
  Expired

Bug description:
  I've a X220 in 14.04 with a docking station connected to an external
  monitor. Undocking my notebook darkens the notebook screen.

  WORKAROUND: Docking it again gives normal brightness and "undocking"
  again gives again regular brightness.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-36-generic 3.13.0-36.63
  ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
  Uname: Linux 3.13.0-36-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  adnc       2737 F.... pulseaudio
   /dev/snd/pcmC0D0p:   adnc       2737 F...m pulseaudio
  CurrentDesktop: Unity
  Date: Fri Oct  3 13:41:38 2014
  HibernationDevice: RESUME=UUID=e24f10db-88ff-46e1-9e2c-15cb62ebb376
  InstallationDate: Installed on 2014-07-02 (92 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 4290C88
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-36-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-36-generic N/A
   linux-backports-modules-3.13.0-36-generic  N/A
   linux-firmware                             1.127.7
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/18/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET69WW (1.39 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4290C88
  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:bvr8DET69WW(1.39):bd07/18/2013:svnLENOVO:pn4290C88:pvrThinkPadX220:rvnLENOVO:rn4290C88:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4290C88
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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