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[EricDHH <1455002@xxxxxxxxxxxxxxxxxx>]

The bios can only be lifted up to 3.17, if the machine got an original
Lenovo battery for 150 bucks. So i can only point that this bug did not
occur under 14.04 LTS. The system was reverted to Ubuntu Mate 15.04 now
and show the same behaviour, screen brightness turns to highest or
lowest at boot. Last state was not saved like in earlier ubuntu
versions.

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https://bugs.launchpad.net/bugs/1455002

Title:
  Thinkpad x200t backlight settings

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  ubuntu 15.04 AMD64

  Howto reproduce this bug that did not exist up to ubuntu 14.10

  Set your required backlight power with the Fn-Keys and shutdown the
  machine. Now bootup again, the login screen and your desktop is on
  lowest backlight power that can be set, maybe you have to lower the
  light to see your display. You have to power the backlight up with the
  Fn-Keys after login., but this will not survive next shutdown.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Thu May 14 11:00:23 2015
  DistUpgraded: 2015-04-25 23:23:28,368 DEBUG enabling apt cron job
  DistroCodename: vivid
  DistroVariant: ubuntu
  DkmsStatus:
   tp-smapi, 0.41, 3.13.0-49-generic, x86_64: installed
   tp-smapi, 0.41, 3.16.0-34-generic, x86_64: installed
   tp-smapi, 0.41, 3.19.0-15-generic, x86_64: installed
   tp-smapi, 0.41, 3.19.0-16-generic, x86_64: installed
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, if not too technical
  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]
  InstallationDate: Installed on 2014-09-17 (238 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: LENOVO 7453WVK
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-16-generic root=UUID=dbb1913f-e1d6-42eb-b68f-221fd8326a6b ro quiet splash elevator=deadline vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to vivid on 2015-04-25 (18 days ago)
  dmi.bios.date: 11/16/2009
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7WET61WW (3.11 )
  dmi.board.name: 7453WVK
  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:bvr7WET61WW(3.11):bd11/16/2009:svnLENOVO:pn7453WVK:pvrThinkPadX200T:rvnLENOVO:rn7453WVK:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 7453WVK
  dmi.product.version: ThinkPad X200T
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
  xserver.bootTime: Thu May 14 10:56:56 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               16401 
   vendor                                     LEN
  xserver.version: 2:1.17.1-0ubuntu3

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