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[Jack Ramsay <jack@xxxxxxxxxxx>]

Here's the thread from ubuntu forums where this has been disscussed http://ubuntuforums.org/showthread.php?t=2181534. 
Christopher, This is more than an issue with the B570 as this is happening to most computers with Intel Graphics. The workaround is written here https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1244645/comments/4 as all it does is load an x11 module for the Intel Backlight device wich for some reason is not loaded upon installation by default.

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https://bugs.launchpad.net/bugs/1244645

Title:
  8086:0106 [Lenovo B570] Brightness is at 100 percent and will not
  change

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I have seen this issue before as it was in the 13.10 betas. When I try
  any setting and method to change the brigtness it fails and remains at
  100%. PLease feel free to contact me to get more information

  WORKAROUND: Create /usr/share/X11/xorg.conf.d/20-intel.conf with the following text:
  Section "Device"
      Identifier "card0"
      Driver "intel"
      Option "Backlight" "intel_backlight"
      BusID "PCI:0:2:0"

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu6
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  NonfreeKernelModules: wl
  .tmp.unity.support.test.0:

  ApportVersion: 2.12.6-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDmesg:
   [   22.303888] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
   [   22.304339] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
   [   54.899779] ISO 9660 Extensions: Microsoft Joliet Level 3
   [   54.952839] ISO 9660 Extensions: RRIP_1991A
  Date: Fri Oct 25 07:36:52 2013
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus: bcmwl, 6.30.223.141+bdcom, 3.11.0-12-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0106] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:3975]
  InstallationDate: Installed on 2013-10-25 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20131021.1)
  MachineType: LENOVO 1068BAU
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic.efi.signed root=UUID=96b54589-c267-4291-b79c-3ff62dddb522 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/27/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 44CN43WW
  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:bvr44CN43WW:bd10/27/2011:svnLENOVO:pn1068BAU:pvrLenovoB570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1:
  dmi.product.name: 1068BAU
  dmi.product.version: Lenovo B570
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.46-3ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.2-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.2-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
  xserver.bootTime: Fri Oct 25 07:34:51 2013
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                 826
   vendor                                     LGD
  xserver.version: 2:1.14.3-3ubuntu3

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