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[Bug 1354710] Re: Backlight control does not work, but there are entries in /sys/class/backlight. Lenovo B570

 

tested listed kernels
non listed kernels are ones that where unbootable 


3.7.0-030700-generic backlight not yet working
3.7.0-030700rc6-generic backlight not yet working

3.8.9-030809-generic backlight working
3.8.10-030810-generic backlight working
3.8.11-030811-generic backlight working
3.8.12-030812-generic backlight working
3.8.13-030813-generic backlight working
3.8.13-03081301-generic backlight working
3.8.13-03081302-generic backlight working
3.8.13-03081303-generic backlight working
3.8.13-03081304-generic backlight working
3.8.13-03081305-generic backlight working
3.8.13-03081306-generic backlight working
3.8.13-03081307-generic backlight working
3.8.13-03081308-generic backlight working
3.8.13-03081309-generic backlight working
3.8.13-03081310-generic backlight working
3.8.13-03081311-generic backlight working
3.8.13-03081312-generic backlight working
3.8.13-03081313-generic backlight working
3.8.13-03081314-generic backlight working
3.8.13-03081315-generic backlight working
3.8.13-03081316-generic backlight working
3.8.13-03081317-generic backlight working
3.8.13-03081318-generic backlight working
3.8.13-03081319-generic backlight working
3.8.13-03081320-generic backlight working
3.8.13-03081321-generic backlight working
3.8.13-03081322-generic backlight working
3.8.13-03081323-generic backlight working 
3.8.13-03081324-generic backlight working
3.8.13-03081325-generic backlight working
3.8.13-03081326-generic backlight working
3.8.13-03081327-generic backlight working
3.8.13-03081328-generic backlight working

3.9.0-030900-generic backlight backlight working
3.9.0-030900rc7-generic backlight backlight working
3.9.0-030900rc8-generic backlight backlight working
3.9.1-030901-generic backlight backlight working
3.9.2-030902-generic backlight backlight working
3.9.3-030903-generic backlight backlight working
3.9.4-030904-generic backlight backlight working
3.9.5-030905-generic backlight backlight working
3.9.6-030906-generic backlight backlight working
3.9.7-030907-generic backlight backlight working
3.9.8-030908-generic backlight backlight working
3.9.9-030909-generic backlight backlight working
3.9.10-030910-generic backlight backlight working
3.9.11-030911-generic backlight backlight working

3.10.0-031000rc1-generic backlight doesn’t work
3.10.0-031000rc2-generic backlight doesn’t work
3.10.0-031000rc3-generic backlight doesn’t work
3.10.0-031000rc4-generic backlight doesn’t work
3.10.0-031000rc5-generic backlight doesn’t work
3.10.0-031000rc6-generic backlight doesn’t work
3.10.0-031000rc7-generic backlight doesn’t work
3.10.0-031000-generic backlight doesn’t work

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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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References