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[Adam Lee <adam.lee@xxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1417915 ***
    https://bugs.launchpad.net/bugs/1417915

** This bug has been marked a duplicate of bug 1417915
   ThinkPad T550: thinkpad_acpi is not loaded automatically

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https://bugs.launchpad.net/bugs/1431171

Title:
  [Lenovo X250] The brightness keys are useless after 14.04.2 install on
  X250

Status in HWE Next Project:
  Confirmed
Status in linux-lts-utopic package in Ubuntu:
  Confirmed

Bug description:
  Steps:
  1. Install 14.04.2 on Lenovo X250
  2. Log in system and try to use the keys to adjust brighness
  3. Install 14.04.1 on Lenovo X250 then upgrade system to 14.04.2
  4. Log in system and try to use the keys to adjust brighness

  Expected result:
  The keys can adjust brightness.

  Actual result:
  Brightness keys are useless 

  Note:
  Brightness can be adjusted by System settings -> Brightness & Lock -> Brightness bar.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-31-generic 3.16.0-31.41~14.04.1
  ProcVersionSignature: Ubuntu 3.16.0-31.41~14.04.1-generic 3.16.7-ckt5
  Uname: Linux 3.16.0-31-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Mar 12 02:13:11 2015
  InstallationDate: Installed on 2015-03-11 (0 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)

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