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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

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

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

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https://bugs.launchpad.net/bugs/1300689

Title:
  No backlight found on system with Lubuntu 12.04

Status in “linux” package in Ubuntu:
  Invalid

Bug description:
  Labtop HP Pavilion HDX 9150EF with Lubuntu 12.04.4 LTS, Kernel Linux
  3.2.0-60-generic (x86_64) has acceptable visual quality but lacks
  brillance and is somewhat dark.

  This is first time Linux is installed on this machine.

  Open source Radeon drivers installed according to: http://doc.ubuntu-
  fr.org/radeon

  XFCE manager does not dim the display.

  Brightness control created according to: http://www.omgubuntu.co.uk/2013/04/brightness-control-ubuntu
  return the message "no backlights were found on your system".

  Grub file changed according to: http://www.refreshit.info/2012/08/solved-brightness-increase-and-decrease.html#.Uzp8ch_I0fA
  but with no effect.

  According to reporting Backlight Bugs from https://wiki.ubuntu.com/Kernel/Debugging/Backlight
  I checked that backlight control does not work and there are no entries in /sys/class/backlight.

  Therefore it should be an ACPI issue if I understand correctly.

  Is there a way to activate or manage backlight on this system to
  recover original brillance?

  Best regards,
  Nicolas

  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
  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:  nicolas    1883 F.... pulseaudio
   /dev/snd/controlC0:  nicolas    1883 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xe8404000 irq 51'
     Mixer name	: 'SigmaTel STAC9271D'
     Components	: 'HDA:83847627,30d4103c,00100201'
     Controls      : 23
     Simple ctrls  : 12
  Card1.Amixer.info:
   Card hw:1 'HDMI'/'HDA ATI HDMI at 0xe8310000 irq 52'
     Mixer name	: 'ATI R6xx HDMI'
     Components	: 'HDA:1002aa01,00aa0100,00100000'
     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: Tue Apr  1 10:42:45 2014
  HibernationDevice: RESUME=UUID=30f70a08-6eeb-4713-a061-ec58ec336dc4
  InstallationMedia: Lubuntu 12.04 "Precise Pangolin" - Release amd64 (20120423)
  MachineType: Hewlett-Packard HP Pavilion HDX9000 Notebook PC
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-60-generic root=UUID=5e9ec670-275b-41d9-99b1-9bf72e010269 ro quiet splash pcie_aspm=force acpi_backlight=vendor 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                            1.94
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/28/2008
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68DVD Ver. F.40
  dmi.board.name: 30D4
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 86.17
  dmi.chassis.asset.tag: CNU7413YH1
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68DVDVer.F.40:bd08/28/2008:svnHewlett-Packard:pnHPPavilionHDX9000NotebookPC:pvrF.40:rvnHewlett-Packard:rn30D4:rvrKBCVersion86.17:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP Pavilion HDX9000 Notebook PC
  dmi.product.version: F.40
  dmi.sys.vendor: Hewlett-Packard

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