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[Bug 1261853] Re: impossible to adjust the screen backlight


Alex Barattini, as per http://www.dell.com/support/drivers/us/en/19/Product/inspiron-15r-5521 an update is available for your BIOS (A12). If you update to this following https://help.ubuntu.com/community/BiosUpdate , does it change anything? If it doesn't, could you please both specify what happened, and just provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Please note your current BIOS is already in the Bug Description, so
posting this on the old BIOS would not be helpful.

For more on BIOS updates and linux, please see

Thank you for your understanding.

** This bug is no longer a duplicate of bug 1225811
   [Dell Inspiron 15R 5521] Can't toggle backlight brightness

** Tags added: bios-outdated-a12

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Summary changed:

- impossible to adjust the screen backlight
+ [Dell Inspiron 15R 5521] Impossible to adjust the screen backlight

** Summary changed:

- [Dell Inspiron 15R 5521] Impossible to adjust the screen backlight
+ 8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen backlight

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  8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen

Status in “linux” package in Ubuntu:

Bug description:
  the change in the level of illumination of the screen, through the
  corresponding option in the control panel, has no effect

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-14-generic 3.11.0-14.21
  ProcVersionSignature: Ubuntu 3.11.0-14.21-generic 3.11.7
  Uname: Linux 3.11.0-14-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
   /dev/snd/controlC0:  alex       1443 F.... pulseaudio
                        alex      11159 F.... pulseaudio
  Date: Tue Dec 17 18:50:13 2013
  HibernationDevice: RESUME=UUID=04335018-6e1d-453d-a8ba-25ae1c34f2eb
  InstallationDate: Installed on 2013-12-14 (2 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: Dell Inc. Inspiron 5521
  MarkForUpload: True
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic.efi.signed root=UUID=d4cdcfba-0a53-41d0-a9ce-0516d3fab0f0 ro quiet splash vt.handoff=7
   linux-restricted-modules-3.11.0-14-generic N/A
   linux-backports-modules-3.11.0-14-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/22/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A06
  dmi.board.name: 0K08H3
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A06
  dmi.modalias: dmi:bvnDellInc.:bvrA06:bd02/22/2013:svnDellInc.:pnInspiron5521:pvrA06:rvnDellInc.:rn0K08H3:rvrA00:cvnDellInc.:ct8:cvrA06:
  dmi.product.name: Inspiron 5521
  dmi.product.version: A06
  dmi.sys.vendor: Dell Inc.

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