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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Thank you for taking the time to file a bug report on this issue.

However, given the number of bugs that the Kernel Team receives during
any development cycle it is impossible for us to review them all.
Therefore, we occasionally resort to using automated bots to request
further testing. This is such a request.

  With the recent release of this Ubuntu release, would like to confirm
if this bug is still present. Please test again with the newer kernel
and indicate in the bug if this issue still exists or not.

You can update to the latest development kernel by simply running the
following commands in a terminal window:

    sudo apt-get update
    sudo apt-get dist-upgrade

If the bug still exists, change the bug status from Incomplete to
Confirmed. If the bug no longer exists, change the bug status from
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 Thank you for your help, we really do appreciate it.


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

** Tags added: kernel-request-3.13.0-24.46

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https://bugs.launchpad.net/bugs/1276037

Title:
  [Thinkpad T420s] Brightness dims when unplugging external monitor and
  cannot be changed afterwards

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Steps to reproduce

  1) Plug a T420s to an external monitor using Displayport
  2) Both external and internal monitor  look right
  3) Unplug (via software or hardware) the external monitor

  Expected results:
  The brightness in the internal monitor stays the same and it can be changed through system keys or system settings

  Actual results:
  The brightness in the internal monitor  dims and it cannot be changed until the system is rebooted

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-6-generic 3.13.0-6.23
  ProcVersionSignature: Ubuntu 3.13.0-6.23-generic 3.13.0
  Uname: Linux 3.13.0-6-generic x86_64
  ApportVersion: 2.13.2-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ara        2409 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Feb  4 09:06:02 2014
  HibernationDevice: RESUME=UUID=85ebfa4c-a925-4edf-9764-79ecfaa29ae6
  InstallationDate: Installed on 2013-06-17 (231 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: LENOVO 4171CTO
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-6-generic root=UUID=35693a74-fe03-4399-920c-24bfaf0a5649 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-6-generic N/A
   linux-backports-modules-3.13.0-6-generic  N/A
   linux-firmware                            1.123
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-01-20 (14 days ago)
  dmi.bios.date: 07/11/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8CET54WW (1.34 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4171CTO
  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:bvr8CET54WW(1.34):bd07/11/2012:svnLENOVO:pn4171CTO:pvrThinkPadT420s:rvnLENOVO:rn4171CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4171CTO
  dmi.product.version: ThinkPad T420s
  dmi.sys.vendor: LENOVO

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