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[madbiologist <1331442@xxxxxxxxxxxxxxxxxx>]

This might be fixed in the upcoming 3.18 kernel by this patch:

Stepan Bujnak:
ACPI / video: force vendor backlight on Lenovo Ideapad Z570

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https://bugs.launchpad.net/bugs/1331442

Title:
  Screen Brightness keys do not work on Lenovo IdeaPad Z570

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I've installed 14.04 from scratch but had this issue under 13.10 too.

  The key combination Fn+<brightness up/down> trigger the brightness
  overlay in the top right corner but the actual brightness does not
  change. See attached screenshot

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-29-generic 3.13.0-29.53
  ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
  Uname: Linux 3.13.0-29-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  seb        1951 F.... pulseaudio
   /dev/snd/pcmC0D0p:   seb        1951 F...m pulseaudio
  CurrentDesktop: Unity
  Date: Wed Jun 18 22:25:22 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-06-14 (3 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64+mac (20140417)
  MachineType: LENOVO 10247MM
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-29-generic root=UUID=4424b647-bd6c-425e-bc1f-a170d430217d ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-29-generic N/A
   linux-backports-modules-3.13.0-29-generic  N/A
   linux-firmware                             1.127.2
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
   
  dmi.bios.date: 10/21/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 45CN38WW
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Emerald Lake
  dmi.board.vendor: LENOVO
  dmi.board.version: FAB1
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnLENOVO:bvr45CN38WW:bd10/21/2011:svnLENOVO:pn10247MM:pvrIdeapadZ570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1:
  dmi.product.name: 10247MM
  dmi.product.version: Ideapad Z570
  dmi.sys.vendor: LENOVO

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