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[Sebo <sebo.pl+ubuntu.com@xxxxxxxxx>]

Thats what I just wonted to write. The update to the most recent one seems to fix the issue.
However what I might not noticed before is that this backlight adjustment is not changing anything.

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https://bugs.launchpad.net/bugs/1370365

Title:
  After the last `apt-get update` the screen backlight is turned off.

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Cause: After the last `apt-get update` and system `reboot` the screen backlight is turned off.
  Expected: The screen is expected to have the backlight turned on or at least to be able to set it on.

  Comment:
  The last update has updated the linux kernel and kernel headers package. After booting up with the new kerlnel the screen backlight has turned off after a second (right after the system boot). I have not found any way to torn it on, no mether if I increase or decrease the backlight setting and no mether if the system is working on batery or with the power cord attached.
  I am running Ubuntu Desktop 14.04 LTS at Dell Vostro-5470.

  $ uname -a
  Linux Vostro-5470 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
  $ lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.57 [modified: boot/vmlinuz-3.13.0-32-generic]
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  sebo       2267 F.... pulseaudio
   /dev/snd/pcmC1D0p:   sebo       2267 F...m pulseaudio
   /dev/snd/controlC0:  sebo       2267 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Sep 17 09:02:17 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-08-08 (39 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Vostro 5470
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-32-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/09/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A00
  dmi.board.name: 0RYY7X
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA00:bd08/09/2013:svnDellInc.:pnVostro5470:pvr:rvnDellInc.:rn0RYY7X:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Vostro 5470
  dmi.sys.vendor: Dell Inc.

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