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[Launchpad Bug Tracker <1199062@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/1199062

Title:
  Can't change screen brightness on Toshiba P855-30D

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  The brightness is locked to the brightest setting (eye-melting-bright).
  I upgraded to the latest BIOS to this date : 6.70
  Below are my different attempts at setting the brightness using the command line (GUI don't work either).

  GRUB_CMDLINE_LINUX=""
  /sys/class/backlight/ is populated
  /sys/class/backlight/acpi_video0/max_brightness:100
  changing /sys/class/backlight/acpi_video0/brightness has no effect

  GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"
  /sys/class/backlight/ is empty

  GRUB_CMDLINE_LINUX="acpi_osi="
  /sys/class/backlight/ is populated
  /sys/class/backlight/acpi_video0/max_brightness:7
  changing /sys/class/backlight/acpi_video0/brightness has no effect

  GRUB_CMDLINE_LINUX="acpi_osi=\"!Windows 2012\""
  /sys/class/backlight/ is populated
  /sys/class/backlight/acpi_video0/max_brightness:7
  changing /sys/class/backlight/acpi_video0/brightness has no effect

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-23-generic 3.8.0-23.34
  ProcVersionSignature: Ubuntu 3.8.0-23.34-generic 3.8.11
  Uname: Linux 3.8.0-23-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  julien     2020 F.... pulseaudio
   /dev/snd/controlC0:  julien     2020 F.... pulseaudio
  Date: Mon Jul  8 19:12:15 2013
  HibernationDevice: RESUME=UUID=26161152-fbf6-4974-b0cd-1986c7a4c449
  InstallationDate: Installed on 2013-05-18 (51 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: TOSHIBA SATELLITE P855
  MarkForUpload: True
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-23-generic root=UUID=dccd4184-97e2-47cd-a183-884c6e410dec ro "acpi_osi=!Windows 2012" quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-23-generic N/A
   linux-backports-modules-3.8.0-23-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/20/2013
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: 6.70
  dmi.board.asset.tag: *
  dmi.board.name: QFKAA
  dmi.board.vendor: TOSHIBA
  dmi.board.version: 1.00
  dmi.chassis.asset.tag: *
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: *
  dmi.modalias: dmi:bvnTOSHIBA:bvr6.70:bd02/20/2013:svnTOSHIBA:pnSATELLITEP855:pvrPSPKBE-04C00CFR:rvnTOSHIBA:rnQFKAA:rvr1.00:cvnTOSHIBA:ct10:cvr*:
  dmi.product.name: SATELLITE P855
  dmi.product.version: PSPKBE-04C00CFR
  dmi.sys.vendor: TOSHIBA

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