Note that the hotkeys work up and down, and the visual slider moves, and
no brightness change is reflected in the display.

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  3.19.0-12.12 brightness regression

Status in linux package in Ubuntu:

Bug description:
  I am seeing lack of brightness control in unity when using the -12.12
  kernel, booting back to -11.11 resolves the issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-12-generic 3.19.0-12.12
  ProcVersionSignature: Ubuntu 3.19.0-12.12-generic 3.19.3
  Uname: Linux 3.19.0-12-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.17-0ubuntu1
  Architecture: amd64
   /dev/snd/controlC0:  apw        3666 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Apr  7 12:01:19 2015
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=56f0e078-c76d-4cf9-a3ef-3b30e0c1a78b
  InstallationDate: Installed on 2013-06-20 (655 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130618)
  MachineType: Intel Corporation 2012 Client Platform
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-12-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash nomdmonddf nomdmonisw 
nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7
   linux-restricted-modules-3.19.0-12-generic N/A
   linux-backports-modules-3.19.0-12-generic  N/A
   linux-firmware                             1.143
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2013-11-10 (512 days ago) 07/30/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: ACRVMBY1.86C.0094.P02.1207301240
  dmi.board.asset.tag: To be filled by O.E.M. Latexo FFRD
  dmi.board.vendor: Intel Corporation
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 9
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
dmi:bvnAmericanMegatrendsInc.:bvrACRVMBY1.86C.0094.P02.1207301240:bd07/30/2012:svnIntelCorporation:pn2012ClientPlatform:pvrTobefilledbyO.E.M.:rvnIntelCorporation:rnLatexoFFRD:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct9:cvrToBeFilledByO.E.M.: 2012 Client Platform
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Intel Corporation

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