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[Henk-Jan <1307064@xxxxxxxxxxxxxxxxxx>]

Thanks Will, this helped.
The "acpi_backlight=vendor" fix in grub worked for me in 13.04 and 13.10, but stopped working in 14.04.

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https://bugs.launchpad.net/bugs/1307064

Title:
  Ubuntu 14.04 Beta cannot adjust brightness on Lenovo Ideapad Z570

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Fresh install of 14.04 on my laptop cannot adjust brightness.  When
  fn+up arrow or fn+down arrow are used, the indicator in the upper
  right hand corner as if the brightness should change, but it does not.
  Also, if one tries to use the slider in the power applet, the
  brightness does not change.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  will       2960 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Apr 12 21:36:57 2014
  HibernationDevice: RESUME=UUID=dfa51f33-0f34-4383-8194-93656983323d
  InstallationDate: Installed on 2014-04-13 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  MachineType: LENOVO 10249RU
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=7420c61f-1836-4a44-84dc-71573190ff4c 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
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  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:pn10249RU:pvrIdeapadZ570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1:
  dmi.product.name: 10249RU
  dmi.product.version: Ideapad Z570
  dmi.sys.vendor: LENOVO

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