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[Launchpad Bug Tracker <780625@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

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

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https://bugs.launchpad.net/bugs/780625

Title:
  "acpi_backlight=vendor" needs to be present in kernel cmdline to have
  backlight working

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  On my laptop I had to add "acpi_backlight=vendor" into kernel cmdline
  to get working backlight. This state is since beginning (10.04 +
  maverick kernels during uds-m).

  If I remove that argument then /sys/class/backlight/acpi_video0/ is
  created instead of 'asus_laptop' one and changing backlight by
  hardware keys works randomly - pressing BacklightUp does nothing or
  decrease or increase level (same with BacklightDown key).

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: linux-image-2.6.39-1-generic 2.6.39-1.6
  ProcVersionSignature: Ubuntu 2.6.39-1.6-generic 2.6.39-rc6
  Uname: Linux 2.6.39-1-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  hrw        2993 F.... xfce4-volumed
                        hrw        3012 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfe9f4000 irq 46'
     Mixer name	: 'Intel Cantiga HDMI'
     Components	: 'HDA:10ec0269,10431443,00100004 HDA:80862802,80860101,00100000'
     Controls      : 15
     Simple ctrls  : 8
  Date: Tue May 10 18:26:48 2011
  HibernationDevice: RESUME=UUID=042b5e75-5bf6-43a9-b93d-957be35f77ec
  MachineType: ASUSTeK Computer Inc. UL30A
  ProcEnviron:
   SHELL=/bin/bash
   LANG=pl_PL.UTF-8
   LANGUAGE=pl_PL:en
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.39-1-generic root=/dev/mapper/hostname-rootfs ro loop.max_loop=256 acpi_backlight=vendor loglevel=0 crashkernel=384M-2G:64M,2G-:128M quiet
  RelatedPackageVersions:
   linux-restricted-modules-2.6.39-1-generic N/A
   linux-backports-modules-2.6.39-1-generic  N/A
   linux-firmware                            1.52
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/28/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 212
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UL30A
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr212:bd12/28/2009:svnASUSTeKComputerInc.:pnUL30A:pvr1.0:rvnASUSTeKComputerInc.:rnUL30A:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: UL30A
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.

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