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[Bug 1178205] Re: [Toshiba Tecra R850-19Z] Screen brightness not changable via applet or hotkeys in Ubuntu 12.04

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Thu, 03 Oct 2013 10:02:50 -0000
Reply-to: Bug 1178205 <1178205@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

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

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https://bugs.launchpad.net/bugs/1178205

Title:
  [Toshiba Tecra R850-19Z] Screen brightness not changable via applet or
  hotkeys in Ubuntu 12.04

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  By default the screen is very dark and almost unreadable. The Fn+F6/7
  hotkeys show the brightness applet but don't change the brightness.
  Attached info according to
  https://wiki.ubuntu.com/Kernel/Debugging/Backlight below.

  WORKAROUND: acpi_backlight=vendor

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-41-generic-pae 3.2.0-41.66
  ProcVersionSignature: Ubuntu 3.2.0-41.66-generic-pae 3.2.42
  Uname: Linux 3.2.0-41-generic-pae i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.2
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1655 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xc4820000 irq 50'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:10ec0269,11790628,00100100 HDA:80862805,11790001,00100000'
     Controls      : 29
     Simple ctrls  : 11
  Date: Thu May  9 12:14:51 2013
  HibernationDevice: RESUME=UUID=add8fe24-1f1e-4ca7-a2d6-a0f40c03383f
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
  MachineType: TOSHIBA TECRA R850
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-41-generic-pae root=UUID=ffc754ea-32ed-4ae7-b471-bca82bd54afb ro elevator=deadline quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-41-generic-pae N/A
   linux-backports-modules-3.2.0-41-generic-pae  N/A
   linux-firmware                                1.79.4
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/25/2011
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 3.10
  dmi.board.asset.tag: 0000000000
  dmi.board.name: Portable PC
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Version A0
  dmi.chassis.asset.tag: 0000000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: Version 1.0
  dmi.modalias: dmi:bvnTOSHIBA:bvrVersion3.10:bd08/25/2011:svnTOSHIBA:pnTECRAR850:pvrPT525E-043021GH:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: TECRA R850
  dmi.product.version: PT525E-043021GH
  dmi.sys.vendor: TOSHIBA

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