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[Aditya <Aditya8892@xxxxxxxxx>]

May be the community is looking for the solution in the wrong direction.
Looking in /sys/class/backlight/  lists 3 folders on my Dell inspiron 7520.
One of the folders is intel_backlight .

Manually doing
root@Sirius:~# echo 2000 >  /sys/class/backlight/intel_backlight/brightness
works.

This means that the problem is somewhere in the X configuration.

>From a thread here https://bugs.freedesktop.org/show_bug.cgi?id=29273
I created an entry in xorg.conf

Section "Device"
        Option     "Backlight"                 "intel_backlight"
        Identifier  "Card0"
        Driver      "intel"
        BusID       "PCI:0:2:0"
EndSection

I created this by using X -c
and copying only relevant section to /etc/X11/xorg.conf

The controls are working fine now. I *do not* have acpi_backlight=vendor .
I just have  acpi_osi=Linux , and I am not very sure if it is needed at all.


** Bug watch added: freedesktop.org Bugzilla #29273
   https://bugs.freedesktop.org/show_bug.cgi?id=29273

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https://bugs.launchpad.net/bugs/1007765

Title:
  brightness adjusting crashes system

Status in “fglrx-installer” package in Ubuntu:
  Confirmed
Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  When adjusting my laptops brightness the system crashes.

  what logs do in need to add and how to get them?

  System:
  -- Dell Studio 1558
  -- Ubuntu 12.04

  Video showing the process: http://www.youtube.com/watch?v=Vxp_rWXHnrg
  --- 
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.0.1-0ubuntu8
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,neg,commands,put]
  CompositorRunning: None
  DistUpgraded: 2012-01-26 12:27:33,165 DEBUG enabling apt cron job
  DistroCodename: precise
  DistroRelease: Ubuntu 12.04
  DistroVariant: ubuntu
  DkmsStatus:
   bcmwl, 5.100.82.38+bdcom, 3.2.0-23-generic, x86_64: installed
   bcmwl, 5.100.82.38+bdcom, 3.2.0-24-generic, x86_64: installed
   fglrx, 8.960, 3.2.0-20-generic, x86_64: installed
   fglrx, 8.960, 3.2.0-23-generic, x86_64: installed
   fglrx, 8.960, 3.2.0-24-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
  GraphicsCard:
   Advanced Micro Devices [AMD] nee ATI RV710 [Mobility Radeon HD 4500/5100 Series] [1002:9553] (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:0413]
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  JockeyStatus:
   xorg:fglrx_updates - ATI/AMD proprietary FGLRX graphics driver (post-release updates) (Proprietary, Disabled, Not in use)
   kmod:wl - Broadcom STA wireless driver (Proprietary, Enabled, In use) [auto-install]
   xorg:fglrx - ATI/AMD proprietary FGLRX graphics driver (Proprietary, Enabled, In use)
  MachineType: Dell Inc. Studio 1558
  NonfreeKernelModules: fglrx wl
  Package: xorg 1:7.6+12ubuntu1
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-24-generic root=UUID=cd6ba6ea-6e63-41cc-b872-c101873444c6 ro quiet splash
  ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
  Tags:  precise ubuntu
  Uname: Linux 3.2.0-24-generic x86_64
  UpgradeStatus: Upgraded to precise on 2012-01-26 (129 days ago)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 09/13/2010
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A10
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A10
  dmi.modalias: dmi:bvnDellInc.:bvrA10:bd09/13/2010:svnDellInc.:pnStudio1558:pvrA10:rvnDellInc.:rn:rvrA10:cvnDellInc.:ct8:cvrA10:
  dmi.product.name: Studio 1558
  dmi.product.version: A10
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.7.8-0ubuntu1
  version.fglrx-installer: fglrx-installer N/A
  version.ia32-libs: ia32-libs 20090808ubuntu36
  version.libdrm2: libdrm2 2.4.32-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

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