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[anon512 <abpabp@xxxxxxx>]

Tested Linux v3.17-rc3 http://kernel.ubuntu.com/~kernel-
ppa/mainline/v3.17-rc3-utopic/ confirmed bug exists in 3.17-rc3

** Tags removed: kernel-unable-to-test-upstream
** Tags added: kernel-bug-exists-upstream

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

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https://bugs.launchpad.net/bugs/1354710

Title:
  Backlight control does not work, but there are entries in
  /sys/class/backlight. Lenovo B570

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Laptop model: Lenovo B570
  package version: Ubuntu 3.13.0-32.57-generic 3.13.11.4

  I expected the keys for changeing the backlight brightness to work
  they had no effect on the backlight

  further details in attatched Tar

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.57
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic i686
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  x321x321   1977 F.... pulseaudio
  Date: Sat Aug  9 16:11:34 2014
  HibernationDevice: RESUME=UUID=61c2c6a6-4b45-4af0-941a-dadf05ad0aba
  InstallationDate: Installed on 2014-07-31 (8 days ago)
  InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140723)
  MachineType: LENOVO 1068FJG
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-32-generic root=/dev/mapper/xubuntu--vg-root ro quiet splash vt.handoff=7
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/11/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 44CN36WW
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Emerald Lake
  dmi.board.vendor: LENOVO
  dmi.board.version: FAB1
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnLENOVO:bvr44CN36WW:bd07/11/2011:svnLENOVO:pn1068FJG:pvrLenovoB570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1:
  dmi.product.name: 1068FJG
  dmi.product.version: Lenovo B570
  dmi.sys.vendor: LENOVO

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