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[Launchpad Bug Tracker <1119957@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/1119957

Title:
  Backlight control does not work, but there are entries in
  /sys/class/backlight

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  Neither the function keys nor the system settings adjust or modify the
  value of the screen brightness. The applet does appear to change, but
  the actual brightness does not change. Directly writing to
  /sys/class/backlight/acpi_video0/brightness does not do anything.

  Model: Toshiba Satellite C855D 
  Video Card:  AMD Radeon HD 7520G (X.Org X server display driver)
  Processor: AMD A6-4400M APU (64-bit)
  OS: Ubuntu 12.10

  Kernel parameter acpi_backlight=vendor does not fix issue

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-17-generic 3.5.0-17.28
  ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
  Uname: Linux 3.5.0-17-generic x86_64
  ApportVersion: 2.6.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  corey      1924 F.... pulseaudio
   /dev/snd/pcmC1D0p:   corey      1924 F...m pulseaudio
   /dev/snd/controlC0:  corey      1924 F.... pulseaudio
  CRDA:
   country EC:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 20), (3, 17)
   	(5250 - 5330 @ 20), (3, 23), DFS
   	(5735 - 5835 @ 20), (3, 30)
  Date: Fri Feb  8 20:33:37 2013
  HibernationDevice: RESUME=UUID=c3ab1a20-57ce-4d15-990c-db0be50ccfc1
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: TOSHIBA Satellite C855D
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-17-generic root=UUID=8182a94c-bc60-427c-8515-8f4cfce63040 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-17-generic N/A
   linux-backports-modules-3.5.0-17-generic  N/A
   linux-firmware                            1.95
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/14/2012
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: 6.10
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Portable PC
  dmi.board.vendor: TOSHIBA
  dmi.board.version: MP
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: OEM Chassis Manufacturer
  dmi.chassis.version: OEM Chassis Version
  dmi.modalias: dmi:bvnInsydeCorp.:bvr6.10:bd09/14/2012:svnTOSHIBA:pnSatelliteC855D:pvrPSCBUU-002008:rvnTOSHIBA:rnPortablePC:rvrMP:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
  dmi.product.name: Satellite C855D
  dmi.product.version: PSCBUU-002008
  dmi.sys.vendor: TOSHIBA

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