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[Tommy Trussell <tommy.trussell@xxxxxxxxx>]

I have noticed the brightness issue on my E540 using the latest BIOS
version 2.17 (I was able to flash mine successfully). I noticed that the
brightness control works better on Ubuntu 14.10, HOWEVER I had several
other more serious problems with it so I downgraded to Ubuntu 14.04.

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https://bugs.launchpad.net/bugs/1414976

Title:
  ThinkPad Brightness

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  While booting up, a message pops up: "thinkpad unsupported brightness
  interface"

  Adjusting brightness works, but is 'choppy' as only four levels of
  brightness seem to be supported.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.57 [modified: boot/vmlinuz-3.13.0-32-generic]
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dagmar     1525 F.... pulseaudio
   /dev/snd/controlC1:  dagmar     1525 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Jan 27 11:08:36 2015
  HibernationDevice: RESUME=UUID=4bda8c46-bb96-497b-9e02-26febd77b783
  InstallationDate: Installed on 2015-01-26 (0 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: LENOVO 20C600LJGE
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic.efi.signed root=UUID=94d57f89-9362-4b77-a5e4-a73e2f799edc ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.11
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/29/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: J9ET93WW (2.13 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20C600LJGE
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50512 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrJ9ET93WW(2.13):bd08/29/2014:svnLENOVO:pn20C600LJGE:pvrThinkPadEdgeE540:rvnLENOVO:rn20C600LJGE:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20C600LJGE
  dmi.product.version: ThinkPad Edge E540
  dmi.sys.vendor: LENOVO

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