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["Akif D." <1377120@xxxxxxxxxxxxxxxxxx>]

I tested "Linux aknoteb 3.17.0-031700rc7-generic #201409281835 SMP Sun
Sep 28 22:36:30 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux"

I've done several tests and they all show that the reported behaviour
does not exists on the above kernel. Is this kernel going to be
published for 14.04 and if yes when?

** Tags added: kernel-fixed-upstream

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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:
  Incomplete

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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