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Yes it is, Toshiba R835 Ubuntu 13.10

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https://bugs.launchpad.net/bugs/832483

Title:
  Toshiba R835-P56X - screen brightness control does not work after
  suspend/resume

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  Toshiba R835-P56X - screen brightness control does not work after
  suspend/resume.  It works just fine before suspend/resume.  After
  suspend/resume, the dbus (or whatever) indicator shows the brightness
  slider-bar changing, but the screen brightness doesn't actually
  change.

  Restarting acpid or acpi-support doesn't make any difference.  Only
  workaround that I've found so far is to reboot the machine.

  I'll be happy to perform any tests that you all can suggest, as well
  as provide more/deeper debugging information.  I've been a Linux
  user/sysadmin since 1998, and I'm proficient in
  programming/development -- but I'm mostly unfamiliar with the acpi and
  Linux's implementation of it.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: acpi-support 0.138
  Uname: Linux 2.6.39-02063904-generic x86_64
  Architecture: amd64
  Date: Tue Aug 23 22:12:11 2011
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: acpi-support
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
  Architecture: amd64
  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:  lukescharf    980 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xc4820000 irq 49'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:10ec0269,1179062e,00100100 HDA:80862805,11790001,00100000'
     Controls      : 17
     Simple ctrls  : 9
  DistroRelease: Ubuntu 11.04
  HibernationDevice: RESUME=UUID=7c62d4f9-0ff6-4fc6-9666-2f70193d0c45
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  MachineType: TOSHIBA PORTEGE R835
  Package: linux (not installed)
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-11-generic root=UUID=d046bba5-6bff-42e7-ae6e-afcab4507acb ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
  RelatedPackageVersions:
   linux-restricted-modules-2.6.38-11-generic N/A
   linux-backports-modules-2.6.38-11-generic  N/A
   linux-firmware                             1.52
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  natty
  Uname: Linux 2.6.38-11-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
  dmi.bios.date: 08/06/2011
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 3.00
  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:bvrVersion3.00:bd08/06/2011:svnTOSHIBA:pnPORTEGER835:pvrPT324U-008003:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: PORTEGE R835
  dmi.product.version: PT324U-008003
  dmi.sys.vendor: TOSHIBA

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