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[Vadim Peretokin <vperetokin@xxxxxxxxx>]

Comment #4 worked for me as when when acpi_backlight tricks in the grub
file failed, while intel_backlight from the terminal was working all
along.

This is Aspire 5740 with Ironlake graphics.

I'm wary of testing an upstream kernel, as this system is already using
the oldest kernel available to due a USB bug which kills sound capture
from USB headsets. Running 13.04.

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https://bugs.launchpad.net/bugs/1158934

Title:
  HP ProBook 6570b using acpi_video0 for backlight rather than
  intel_backlight

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  When pressing the keys to increase or decrease backlight, or even
  using the Display dialog's slider, backlight doesn't change. However,
  the backlight level indicated by the prompt does change. The hardware
  in question is an HP ProBook 6570b laptop.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: xorg 1:7.7+1ubuntu4
  ProcVersionSignature: Ubuntu 3.8.0-13.23-generic 3.8.3
  Uname: Linux 3.8.0-13-generic x86_64
  NonfreeKernelModules: wl
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.9.2-0ubuntu2
  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
  Date: Fri Mar 22 19:31:40 2013
  DistUpgraded: 2013-01-27 21:36:15,133 DEBUG enabling apt cron job
  DistroCodename: raring
  DistroVariant: ubuntu
  DkmsStatus:
   bcmwl, 6.20.155.1+bdcom, 3.8.0-12-generic, x86_64: installed
   bcmwl, 6.20.155.1+bdcom, 3.8.0-13-generic, x86_64: installed
   virtualbox, 4.2.8, 3.8.0-12-generic, x86_64: installed
   virtualbox, 4.2.8, 3.8.0-13-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:17ab]
  InstallationDate: Installed on 2012-11-13 (129 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: Hewlett-Packard HP ProBook 6570b
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-13-generic root=UUID=1a9c19c9-524c-47a2-89da-6dd88cb8f2ee ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to raring on 2013-01-27 (53 days ago)
  dmi.bios.date: 09/24/2012
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68ICE Ver. F.31
  dmi.board.name: 17AB
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 42.32
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68ICEVer.F.31:bd09/24/2012:svnHewlett-Packard:pnHPProBook6570b:pvrA1029D1102:rvnHewlett-Packard:rn17AB:rvrKBCVersion42.32:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ProBook 6570b
  dmi.product.version: A1029D1102
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.9~daily13.03.20-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu36
  version.libdrm2: libdrm2 2.4.42-0ubuntu2
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.3-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.3-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.5-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.6-0ubuntu3b1
  xserver.bootTime: Fri Mar 22 19:28:05 2013
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.13.3-0ubuntu3
  xserver.video_driver: intel

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