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[taj <1255428@xxxxxxxxxxxxxxxxxx>]

I also have Intel graphics in a HP laptop

This fix also works in 14.04:
http://askubuntu.com/questions/362894/changing-the-brightness-stopped-working-in-13-10-saucy-salamander

If you're using intel video card do:

sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf

Add the following in the empty file then log out and log in again or
reboot. That should fix your problem.

Section "Device"
    Identifier  "card0"
    Driver      "intel"
    Option      "Backlight"  "intel_backlight"
    BusID       "PCI:0:2:0"

EndSection

Thanks Tatakai Wasumi for that solution!

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https://bugs.launchpad.net/bugs/1255428

Title:
  8086:0116 [Lenovo IdeaPad Z570] LCD brightness control keys and widget
  do not work on Intel Graphics on Saucy

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  After upgrading to Saucy, on my Lenovo IdeaPad Z570 with Intel HD
  Graphics 3000, it is no longer possible to control the LCD brightness
  using the hardware brightness control keys. Likewise for the KDE power
  management settings or the battery icon on my Kubuntu Plasma tray. (I
  don't use GNOME/Unity.) Until Raring I did not have this problem.

  There is a workaround available from
  http://askubuntu.com/questions/362894/changing-the-brightness-stopped-
  working-in-13-10-saucy-salamander i.e. doing the following command on
  a terminal:

  echo 150 | sudo tee /sys/class/backlight/intel_backlight/brightness

  where 150 is on the scale of 0 to whatever is given within
  /sys/class/backlight/intel_backlight/max_brightness.

  Based on this I wrote a GUI which however needs to be run using
  sudo/kdesudo/gksudo. I have attached it.

  Bug #1241745 also relates to the same problem on Saucy but apparently relates to an NVidia driver and I was asked to track this as a separate bug https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1241745/comments/17
  --- 
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  DistroRelease: Ubuntu 13.10
  InstallationDate: Installed on 2013-10-19 (38 days ago)
  InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MarkForUpload: True
  Package: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
  Tags:  saucy
  Uname: Linux 3.11.0-13-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  --- 
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  samjnaa    1717 F.... pulseaudio
  DistroRelease: Ubuntu 13.10
  HibernationDevice: RESUME=UUID=ba00d992-e43e-4bce-8689-9647370add15
  InstallationDate: Installed on 2013-10-19 (117 days ago)
  InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: LENOVO HuronRiver Platform
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=(hd0,msdos9)/vmlinuz root=/dev/sda9 ro quiet splash
  ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-15-generic N/A
   linux-backports-modules-3.11.0-15-generic  N/A
   linux-firmware                             1.116
  StagingDrivers: rts5139
  Tags:  saucy staging
  Uname: Linux 3.11.0-15-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 02/22/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 45CN28WW
  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:bvr45CN28WW:bd02/22/2011:svnLENOVO:pnHuronRiverPlatform:pvrIdeapadZ570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1:
  dmi.product.name: HuronRiver Platform
  dmi.product.version: Ideapad Z570
  dmi.sys.vendor: LENOVO

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