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[Anmar Oueja <anmar.oueja@xxxxxxxxxx>]

I also confirm that problem continue to exists for Ubuntu 14.04 using th
standard Linux X1 3.13.0-30-generic #54-Ubuntu SMP Mon Jun 9 22:45:01
UTC 2014 x86_64 x86_64 x86_64 GNU/Linux kernel.

The way around it is to go the console, adjust the brightness to desired
level, then go back to X.  Brightness adjustment doesn't work at all
when in X. Just console after I unplug the external monitor or reboot
the entire machine.

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https://bugs.launchpad.net/bugs/1291371

Title:
  thinkpad screen dims after unplugging external display, and won't re-
  brighten without leaving X

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  When I un-plug the external VGA cable from my Thinkpad X200s, the
  screen dims.  Hitting Fn-Home (the brightness-increase key) does
  nothing.  Suspending and resuming doesn't reset this, though a reboot
  will allow me to use the brightness controls again while in the POST
  and after.

  My current workaround is that every time I disconnect the monitor, I
  have to C-M-F1 to get to a virtual console, brighten the screen, and
  then M-left to get back to X.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: compiz 1:0.9.11+14.04.20140310-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
  Uname: Linux 3.13.0-17-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,decor,snap,gnomecompat,grid,regex,mousepoll,compiztoolbox,resize,move,wall,animation,vpswitch,place,imgpng,workarounds,expo,fade,ezoom,session,scale,unityshell]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Wed Mar 12 13:22:01 2014
  DistUpgraded: 2014-02-25 19:06:30,487 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  GraphicsCard:
   Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:20e4]
     Subsystem: Lenovo Device [17aa:20e4]
  MachineType: LENOVO 7465CTO
  PackageArchitecture: all
  ProcKernelCmdLine: root=UUID=5237fceb-23d0-412d-84d9-b8f8b3bf28af ro quiet splash
  SourcePackage: compiz
  UpgradeStatus: Upgraded to trusty on 2014-02-25 (14 days ago)
  dmi.bios.date: 06/25/2009
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6DET55WW (3.05 )
  dmi.board.name: 7465CTO
  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:bvr6DET55WW(3.05):bd06/25/2009:svnLENOVO:pn7465CTO:pvrThinkPadX200s:rvnLENOVO:rn7465CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 7465CTO
  dmi.product.version: ThinkPad X200s
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.11+14.04.20140310-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0~rc3-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0~rc3-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Wed Mar 12 09:07:01 2014
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               16404
   vendor                                     LEN
  xserver.version: 2:1.15.0-1ubuntu6

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