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[Fahimeh <fsm.sun@xxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1290308

Title:
  Backlight issue for hotkeys on Dell inspiron laptop

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I work on a Dell Inspiron laptop. The backlight is not working on
  Ubuntu. Is there any known issues like this with Ubuntu on Dell
  machines?

  I've tried some solutions such as changing grub like the following
  sample but still it's not working.

  sudo gedit /etc/default/grub
  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
  sudo update-grub
  Also, I installed xbacklight, but I can only set a value for it once and then I have to restart if I want to decrease the backlight.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-60-generic 3.2.0-60.91
  ProcVersionSignature: Ubuntu 3.2.0-60.91-generic 3.2.55
  Uname: Linux 3.2.0-60-generic x86_64
  NonfreeKernelModules: fglrx wl
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ima        1893 F.... pulseaudio
   /dev/snd/controlC0:  ima        1893 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfbf00000 irq 48'
     Mixer name	: 'IDT 92HD81B1X5'
     Components	: 'HDA:111d7605,10280447,00100105'
     Controls      : 16
     Simple ctrls  : 9
  Card1.Amixer.info:
   Card hw:1 'Generic'/'HD-Audio Generic at 0xfbe40000 irq 49'
     Mixer name	: 'ATI R6xx HDMI'
     Components	: 'HDA:1002aa01,00aa0100,00100200'
     Controls      : 6
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Mon Mar 10 21:21:41 2014
  HibernationDevice: RESUME=UUID=2ed0b425-01e4-4d67-95e8-b667c73cc6df
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  MachineType: Dell Inc. Inspiron N5010
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_AU:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-60-generic root=UUID=726c79d3-d245-4127-b65e-9ef72cca6b5c ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-60-generic N/A
   linux-backports-modules-3.2.0-60-generic  N/A
   linux-firmware                            1.79.10
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: Upgraded to precise on 2014-02-15 (23 days ago)
  dmi.bios.date: 11/17/2010
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: 0YXXJJ
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A10
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A10
  dmi.modalias: dmi:bvnDellInc.:bvrA10:bd11/17/2010:svnDellInc.:pnInspironN5010:pvrA10:rvnDellInc.:rn0YXXJJ:rvrA10:cvnDellInc.:ct8:cvrA10:
  dmi.product.name: Inspiron N5010
  dmi.product.version: A10
  dmi.sys.vendor: Dell Inc.

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