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[To Do <1069144@xxxxxxxxxxxxxxxxxx>]

I managed to solve the problem in a much cleaner way.

I tried to create a custom xorg.conf file with the following content but
my system didn't boot.

Section "Device"
    Identifier  "Intel Graphics"
    Driver      "intel"
    Option      "Backlight"       "intel_backlight" # use your backlight that works here
EndSection

Finally, I tried the following procedure: 
http://askubuntu.com/a/281685/27968

I got errors when starting lightdm BUT it created a xorg.conf.failsafe
file.

I opened it and modified it by adding the option line under "Device" as
follows:

Section "Device"
       Identifier      "Configured Video Device"
       Driver          "intel"
       Option          "Backlight"       "intel_backlight"
EndSection
#
Section "Monitor"
       Identifier      "Configured Monitor"
EndSection
#
Section "Screen"
       Identifier      "Default Screen"
       Monitor         "Configured Monitor"
       Device          "Configured Video Device"
EndSection

And bingo! Everything is working as it should.

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https://bugs.launchpad.net/bugs/1069144

Title:
  [Toshiba Satellite R830-1H3] brightness control works until sleep

Status in The Linux Kernel:
  Incomplete
Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  On my Toshiba Satellite R830, I have 12.10 AMD64. The Fn + F6, Fn + F7
  buttons reduce/increase the brightness level of the screen. The issue
  is that they stop working after waking my computer from sleep. When
  this happens I cannot even control brightness by going to "System
  Settings/Brightness and Lock". I had Ubuntu 12.04 installed before and
  I had the same identical problem. Now I installed the upstream kernel
  3.7rc5 and the situation is even worse, because on wakeup, the
  brightness is at 100% whereas on the standard kernel it remembers the
  brightness value.

  WORKAROUND: I modified /etc/default/grub changing the line:
  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

  to:
  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"

  Then updated grub with:
  sudo update-grub

  and the problem is solved.

  WORKAROUND: As root (not with sudo but actually changing user: su root), change the value in sys/class/backlight/intel_backlight/brightness . For instance:
  echo 2937 > /sys/class/backlight/intel_backlight/brightness

  or better still:
  echo 300 | sudo tee /sys/class/backlight/intel_backlight/brightness > /dev/null

  These values are not between 0 and 7 (as the ones in the other
  directory), but between 284 and 4539, or something like that. Source
  is http://askubuntu.com/a/196863/27968 .

  WORKAROUND: In Raring:
  echo 400 | sudo tee /sys/class/backlight/intel_backlight/brightness

  http://www.toshiba.co.uk/innovation/download_bios.jsp?service=UK

  Sent an e-mail upstream to: http://marc.info/?l=linux-
  acpi&m=136975088406475&w=2

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-32-generic 3.2.0-32.51
  ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
  Uname: Linux 3.2.0-32-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu14
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  chris      1801 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xc4820000 irq 49'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:10ec0269,1179062e,00100100 HDA:80862805,11790001,00100000'
     Controls      : 25
     Simple ctrls  : 12
  Date: Sat Oct 20 19:04:25 2012
  HibernationDevice: RESUME=UUID=7d4873fc-c21f-4172-977f-2fb7c1667f24
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  MachineType: TOSHIBA SATELLITE R830
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-32-generic root=UUID=4ad29e86-825e-4c7c-b220-5eab7199b9e2 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-32-generic N/A
   linux-backports-modules-3.2.0-32-generic  N/A
   linux-firmware                            1.79.1
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/31/2012
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 3.90
  dmi.board.asset.tag: 0000000000
  dmi.board.name: Portable PC
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Version A0
  dmi.chassis.asset.tag: 0000000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: Version 1.0
  dmi.modalias: dmi:bvnTOSHIBA:bvrVersion3.90:bd07/31/2012:svnTOSHIBA:pnSATELLITER830:pvrPT32LE-01Y00DFR:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: SATELLITE R830
  dmi.product.version: PT32LE-01Y00DFR
  dmi.sys.vendor: TOSHIBA
  ---
  ApportVersion: 2.6.1-0ubuntu6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  chris      2074 F.... pulseaudio
   /dev/snd/pcmC0D0c:   chris      2074 F...m pulseaudio
   /dev/snd/pcmC0D0p:   chris      2074 F...m pulseaudio
  DistroRelease: Ubuntu 12.10
  HibernationDevice: RESUME=UUID=7d4873fc-c21f-4172-977f-2fb7c1667f24
  InstallationDate: Installed on 2012-09-19 (54 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  MachineType: TOSHIBA SATELLITE R830
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-18-generic root=UUID=4ad29e86-825e-4c7c-b220-5eab7199b9e2 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-18-generic N/A
   linux-backports-modules-3.5.0-18-generic  N/A
   linux-firmware                            1.95
  Tags:  quantal running-unity
  Uname: Linux 3.5.0-18-generic x86_64
  UpgradeStatus: Upgraded to quantal on 2012-10-23 (20 days ago)
  UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 07/31/2012
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 3.90
  dmi.board.asset.tag: 0000000000
  dmi.board.name: Portable PC
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Version A0
  dmi.chassis.asset.tag: 0000000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: Version 1.0
  dmi.modalias: dmi:bvnTOSHIBA:bvrVersion3.90:bd07/31/2012:svnTOSHIBA:pnSATELLITER830:pvrPT32LE-01Y00DFR:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: SATELLITE R830
  dmi.product.version: PT32LE-01Y00DFR
  dmi.sys.vendor: TOSHIBA

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