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[Sandesh C <sandeshc13@xxxxxxxxx>]

** Attachment added: "lspci-vnvn.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1297095/+attachment/4042053/+files/lspci-vnvn.log

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https://bugs.launchpad.net/bugs/1297095

Title:
  Backlight control not working in Lenovo Y500

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I have done :
  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor"
  in /etc/defaults/grub.cfg and update-grub
  still i'm am unable to control the the screen brightness

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-18-generic 3.11.0-18.32
  ProcVersionSignature: Ubuntu 3.11.0-18.32-generic 3.11.10.4
  Uname: Linux 3.11.0-18-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  sandeshc   1905 F.... pulseaudio
   /dev/snd/controlC0:  sandeshc   1905 F.... pulseaudio
   /dev/snd/pcmC0D0p:   sandeshc   1905 F...m pulseaudio
  Date: Tue Mar 25 11:12:58 2014
  HibernationDevice: RESUME=UUID=fc659f72-e4d7-4434-bed8-f0f2ee54da04
  InstallationDate: Installed on 2014-02-25 (27 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: LENOVO 20193
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_IN:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_IN
   SHELL=/bin/bash
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-18-generic.efi.signed root=UUID=f357b7eb-d6f6-44ea-82d9-9cb2d64b8825 ro quiet splash thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-18-generic N/A
   linux-backports-modules-3.11.0-18-generic  N/A
   linux-firmware                             1.116.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/21/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6BCN44WW(V2.04)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900004WIN8 STD SGL
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad Y500
  dmi.modalias: dmi:bvnLENOVO:bvr6BCN44WW(V2.04):bd05/21/2013:svnLENOVO:pn20193:pvrLenovoIdeaPadY500:rvnLENOVO:rnINVALID:rvr31900004WIN8STDSGL:cvnLENOVO:ct10:cvrLenovoIdeaPadY500:
  dmi.product.name: 20193
  dmi.product.version: Lenovo IdeaPad Y500
  dmi.sys.vendor: LENOVO

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