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[Chris J Arges <1313830@xxxxxxxxxxxxxxxxxx>]

I've also had this happen on my Thinkpad T420.

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https://bugs.launchpad.net/bugs/1313830

Title:
  [Lenovo ThinkPad X230] LCD Backlight dims completely when
  disconnecting external monitor

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  Confirmed

Bug description:
  After undocking with external DVI monitor connected to dock the
  laptop's internal LCD dims all the way (backlight still on, but as dim
  as it goes). Keyboard backlight controls cause OSD indicator to show
  backlight changing but no affect on LCD brightness.

  Issue also reported for RedHat here:
  https://bugzilla.redhat.com/show_bug.cgi?id=1067071

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dustin     2683 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Apr 28 10:13:42 2014
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=79c0f3ac-bda7-4a28-9ae1-6bb19ab0fd0d
  InstallationDate: Installed on 2013-10-08 (201 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Beta amd64 (20130925.1)
  MachineType: LENOVO 2306CTO
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=2f1bbe89-ca2f-4884-8fc6-8a476dd1a475 ro
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-01-08 (109 days ago)
  dmi.bios.date: 03/05/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ETA0WW (2.60 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2306CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG2ETA0WW(2.60):bd03/05/2013:svnLENOVO:pn2306CTO:pvrThinkPadX230:rvnLENOVO:rn2306CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2306CTO
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO

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