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[postadelmaga <postadelmaga@xxxxxxxxx>]

*** This bug is a duplicate of bug 1163720 ***
    https://bugs.launchpad.net/bugs/1163720

I t could be the same problem reported here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1229591

For me is still present in 15.04

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https://bugs.launchpad.net/bugs/1166495

Title:
  Brightness fn keys don't work on dell xps 13 ultrabook

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Have found this bug with the last few kernels in raring ringtail with
  my dell xps 13 ultrabook. Neither of the fn keys for brightness
  work... very frustrating! This seems to be a regression in the kernel,
  so I have marked this as an issue with the linux-header-kernel
  packages.

  When I boot the computer I have this issue, as well as when the screen
  times out, or when I wake from suspend. The screen is stuck on 100%
  brightness. I have created a simple 'brightness-fix' script which I've
  put in /usr/local/bin, and run as root whenever I need to have the
  brightness less than 100%. I haven't looked to implment a better
  workaround, as I'm hoping for a more permanent fix from the kernel
  devs. My script for this is below:

  ---- code ----
  #!/bin/bash

  #FIx for brightness control:
  echo 0 > /sys/class/backlight/intel_backlight/brightness
  ---- end code ----

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-headers-3.8.0-17 3.8.0-17.27
  ProcVersionSignature: Ubuntu 3.8.0-17.27-generic 3.8.6
  Uname: Linux 3.8.0-17-generic x86_64
  ApportVersion: 2.9.2-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mitchell   2039 F.... pulseaudio
  Date: Tue Apr  9 07:56:50 2013
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=44202eef-4580-4844-9e5e-17436f2d39bd
  InstallationDate: Installed on 2013-03-27 (12 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130326)
  MachineType: Dell Inc. Dell System XPS L321X
  MarkForUpload: True
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_AU:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-17-generic root=UUID=89891af3-60e2-4cb3-90e6-3280208bf5b9 ro quiet splash vt.handoff=7
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-17-generic N/A
   linux-backports-modules-3.8.0-17-generic  N/A
   linux-firmware                            1.104
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/14/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd08/14/2012:svnDellInc.:pnDellSystemXPSL321X:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L321X
  dmi.sys.vendor: Dell Inc.

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