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[osprey <872932@xxxxxxxxxxxxxxxxxx>]

I've installed the testing kernel from Kamal Mostafa's ppa and it solved the issue.
Now the alternating brightness problem disappeared from my Dell Latitude D430.
More details about the patch can be found at the following address
 https://launchpad.net/~kamalmostafa/+archive/inverted-backlight

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https://bugs.launchpad.net/bugs/872932

Title:
  Brightness

Status in “gnome-settings-daemon” package in Ubuntu:
  In Progress

Bug description:
  Brightness will not maintain its settings.  Keeps reverting to a dim
  display.  Constantly have to function up ( increase screen brightness)
  on dell latitude D610.  was stable on releases prior to 11.10

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: xorg 1:7.6+7ubuntu7
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  Uname: Linux 3.0.0-12-generic i686
  .tmp.unity.support.test.0:
   
  ApportVersion: 1.23-0ubuntu3
  Architecture: i386
  CompizPlugins: [core,bailer,detection,composite,opengl,decor,regex,compiztoolbox,mousepoll,vpswitch,imgpng,wall,resize,unitymtgrabhandles,move,grid,snap,gnomecompat,place,animation,workarounds,fade,session,expo,scale,ezoom,unityshell]
  CompositorRunning: compiz
  Date: Wed Oct 12 10:34:39 2011
  DistUpgraded: Log time: 2011-09-19 12:23:14.212126
  DistroCodename: oneiric
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller [8086:2592] (rev 03) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:0182]
     Subsystem: Dell Device [1028:0182]
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  MachineType: Dell Inc. Latitude D610
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=e3f817e0-cde5-462b-abaf-f6dc6a84604e ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to oneiric on 2011-09-30 (12 days ago)
  dmi.bios.date: 08/11/2005
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0U8082
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd08/11/2005:svnDellInc.:pnLatitudeD610:pvr:rvnDellInc.:rn0U8082:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude D610
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu3
  version.libdrm2: libdrm2 2.4.26-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
  version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

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