kernel-packages team mailing list archive

["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Asif Youssuff, thank you for reporting this and helping make Ubuntu better. As per http://download.lenovo.com/express/ddfm.html an update to your BIOS is available (43). If you update to this following https://help.ubuntu.com/community/BiosUpdate does it change anything?  If it doesn't, could you please both specify what happened, and provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Please note your current BIOS is already in the Bug Description, so
posting this on the old BIOS would not be helpful. As well, you don't
have to create a new bug report.

For more on BIOS updates and linux, please see
https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette
.

Once the BIOS is updated, then please mark this report Status Confirmed.

Thank you for your understanding.

** Tags added: bios-outdated-44cn43ww

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

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

** Summary changed:

- Lenovo v570: Brightness not changing via UI widget in GNOME shell or hotkeys
+ [Lenovo V570 Notebook] Brightness not changing via UI widget in GNOME shell or hotkeys

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1388636

Title:
  [Lenovo V570 Notebook] Brightness not changing via UI widget in GNOME
  shell or hotkeys

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Fresh install of a Vivid Vervet Ubuntu GNOME daily iso.

  Adding debugging information from
  https://wiki.ubuntu.com/Kernel/Debugging/Backlight

  I found that

  echo 8 > /sys/class/backlight/intel_backlight/brightness

  worked to lower my screen brightness, without playing with kernel
  parameters.

  Booting with the kernel parameter: acpi_backlight=vendor did not
  enable the UI widget or hotkeys, although echo 8 >
  /sys/class/backlight/intel_backlight/brightness continued to work.

  Booting with the kernel parameter: video.use_bios_initial_backlight=0
  did not allow for hotkey or widget changes of brightness.

  Booting with the kernel parameter: video.use_native_backlight=1

  Creating /usr/share/X11/xorg.conf.d/80-backlight.conf

  with the contents:

  Section "Device"
      Identifier  "Intel Graphics"
      Driver      "intel"
      Option      "AccelMethod"     "sna"
      Option      "Backlight"       "intel_backlight" # use your backlight that works here
      BusID       "PCI:0:2:0"
  EndSection

  and rebooting does resolve the issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.16.0-24-generic 3.16.0-24.32 [modified: boot/vmlinuz-3.16.0-24-generic]
  ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
  Uname: Linux 3.16.0-24-generic x86_64
  ApportVersion: 2.14.7-0ubuntu9
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  asif       2318 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Sun Nov  2 15:48:05 2014
  HibernationDevice: RESUME=UUID=53025272-1910-418a-9f4a-b6ac00a768f1
  InstallationDate: Installed on 2014-11-01 (1 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Alpha amd64 (20141031)
  MachineType: LENOVO 1066A9U
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-24-generic root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-24-generic N/A
   linux-backports-modules-3.16.0-24-generic  N/A
   linux-firmware                             1.138
  SourcePackage: linux
  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:pn1066A9U:pvrLenovoV570:rvnLENOVO:rnEmeraldLake:rvrFAB1:cvnLENOVO:ct10:cvr0.1:
  dmi.product.name: 1066A9U
  dmi.product.version: Lenovo V570
  dmi.sys.vendor: LENOVO

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