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[Matthias Baur <thats+launchpad@xxxxxxxxxxxxxxx>]

I'm so sorry, i didn't get to it and now traveling the world for a year
without my docking station. Hope someone else finds the time to bisect
this problem.

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https://bugs.launchpad.net/bugs/1378418

Title:
  [Lenovo ThinkPad T430s] Brightness bug in kernel 3.13 when using
  Docking station

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  When undocking my Thinkpad T30s from my dockingstation, the brightness
  is set to the lowest level and can't be changed.

  Workaround:
  - Dock/Undock again. After the second undocking the brightness level can be changed. Rule of thumb: Every uneven undocking won't work.
  - Reboot

  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:  s0me0ne    3001 F.... pulseaudio
  Date: Tue Oct  7 17:35:56 2014
  HibernationDevice: RESUME=UUID=af9ba4ae-e55a-4140-ada0-b0fe89caa5ff
  InstallationDate: Installed on 2014-09-21 (16 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: LENOVO 2356LNG
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-36-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  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: 05/14/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G7ETA0WW (2.60 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2356LNG
  dmi.board.vendor: LENOVO
  dmi.board.version: Win8 Pro MBR TPG
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG7ETA0WW(2.60):bd05/14/2014:svnLENOVO:pn2356LNG:pvrThinkPadT430s:rvnLENOVO:rn2356LNG:rvrWin8ProMBRTPG:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2356LNG
  dmi.product.version: ThinkPad T430s
  dmi.sys.vendor: LENOVO

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