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[Nedyalko Dyakov <me@xxxxxxxxxx>]

I'm on HP Probook 4320s with Xubuntu. After upgrading from 13.04 to
13.10 I cannot change the backlight either.

** Also affects: unity
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1181512

Title:
  Cannot adjust screen brightness

Status in Unity:
  New
Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  Dell Inspiron 15 (3521) i5 64bit laptop

  With Ubuntu 12.04 and 12.10, the Dell Laptop would allow me to change
  screen brightness using Fn+F4 (brightness down) and Fn+F5 (brightness
  up).

  After upgrading to 13.10, the buttons respond but I can only adjust
  brightness one step down from maximum setting and back.

  System Settings > Brightness and Lock - does not allow me to change
  the brightness setting at all. Screen dimming to save power occurs if
  I enable it.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: unity 7.0.0daily13.04.18~13.04-0ubuntu1
  ProcVersionSignature: Ubuntu 3.8.0-22.33-generic 3.8.11
  Uname: Linux 3.8.0-22-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  Date: Sat May 18 17:16:40 2013
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-precise-amd64-20120703-2
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-03-12 (66 days ago)
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20120703-15:08
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: unity
  UpgradeStatus: Upgraded to raring on 2013-05-15 (2 days ago)

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