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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

WinEunuchs2Unix, as you are not the original reporter of this bug report, you would want to file a new bug report (live environment is fine, default Ubuntu kernel) via a terminal:
ubuntu-bug linux

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https://bugs.launchpad.net/bugs/1326161

Title:
  [Toshiba Satellite P70-A] Brightness Hotkey Doesn't Work

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  I followed the steps at
  https://wiki.ubuntu.com/Hotkeys/Troubleshooting and found that the
  brightness keys are only detected with acpi_listen, which apparently
  means "this is a bug in the kernel (ubuntu-bug linux) for not
  translating the ACPI event to an input event"

  Brightness down and up create the following output with acpi_listen,
  respectively:

  button/battery BAT 00000080 00000000 K
  button/sleep SBTN 00000080 00000000 K

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46 [modified: boot/vmlinuz-3.13.0-24-generic]
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  drdanielfc   1816 F.... pulseaudio
   /dev/snd/controlC1:  drdanielfc   1816 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Jun  3 18:34:43 2014
  HibernationDevice: RESUME=UUID=5749c544-7f19-4560-85cf-afb651d8e76f
  InstallationDate: Installed on 2014-06-03 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: TOSHIBA Satellite P70-A
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=b07e9797-ecf0-4bfd-a13c-1f1c53c509f1 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/18/2014
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: 1.50
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: Type2 - Board Product Name1
  dmi.board.vendor: Type2 - Board Vendor Name1
  dmi.board.version: Type2 - Board Version
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: OEM Chassis Manufacturer
  dmi.chassis.version: OEM Chassis Version
  dmi.modalias: dmi:bvnInsydeCorp.:bvr1.50:bd04/18/2014:svnTOSHIBA:pnSatelliteP70-A:pvrPSPLPU-0JS050:rvnType2-BoardVendorName1:rnType2-BoardProductName1:rvrType2-BoardVersion:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
  dmi.product.name: Satellite P70-A
  dmi.product.version: PSPLPU-0JS050
  dmi.sys.vendor: TOSHIBA

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