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[Tommi Helander <1301580@xxxxxxxxxxxxxxxxxx>]

** Attachment added: "ssdt2.dat"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301580/+attachment/4061324/+files/ssdt2.dat

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https://bugs.launchpad.net/bugs/1301580

Title:
  Backlight control does not work, but there are entries in
  /sys/class/backlight

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Backlight control doesn't work in Ubuntu 14.04 on a Lenovo Thinkpad
  T61. Neither using hotkeys nor the brightness applet.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-19-generic 3.13.0-19.40 [modified: boot/vmlinuz-3.13.0-19-generic]
  ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
  Uname: Linux 3.13.0-19-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tommi      1964 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Apr  2 22:53:56 2014
  HibernationDevice: RESUME=UUID=3e4b62ed-a926-47a3-ae19-44b96d1376ee
  InstallationDate: Installed on 2014-03-30 (3 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  MachineType: LENOVO 645745G
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-19-generic root=UUID=01d49c75-94f4-417c-beae-d16fd8b8df83 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-19-generic N/A
   linux-backports-modules-3.13.0-19-generic  N/A
   linux-firmware                             1.126
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/06/2007
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7LETA7WW (2.07 )
  dmi.board.name: 645745G
  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:bvr7LETA7WW(2.07):bd12/06/2007:svnLENOVO:pn645745G:pvrThinkPadT61:rvnLENOVO:rn645745G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 645745G
  dmi.product.version: ThinkPad T61
  dmi.sys.vendor: LENOVO

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