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[Matthias Baur <thats+launchpad@xxxxxxxxxxxxxxx>]

Will do, but i guess not before the weekend. Tonight i've did some easy debugging by just installing some old version (3.14-3.16) of the mainline kernel. It showed, that the actual bug (not being able to adjust the brightness level after undocking) is fixed in those versions as well, but there is some other strange stuff going on. After every undocking the screen is just black. I first thought the OS/windows manger/... crashed, but after some testing it showed, that the brightness level was just set to the lowest possible value which just meant that the display is black/dark. So with 3.14-3.16 the actual bug is fixed but there is some really non-user-friendly behavior with just a black/dark screen.
So i guess i should first bisect 3.13 against 3.14 to find the actual bug(fix)? And after that bisect 3.14 against 3.17 to find the bugfix for the black/dark screen behavior. Right?

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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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