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[Diego-MX <1157440@xxxxxxxxxxxxxxxxxx>]

I have this problem on Ubuntu 15.04, my laptop is Lenovo Ideapad P500. 
This is a fresh install.   
I already tried several workaround from stack overflow, and none worked.

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https://bugs.launchpad.net/bugs/1157440

Title:
  1002:9808 [Lenovo E435, M490s]: Brightness controls do not work

Status in amd:
  Incomplete
Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Precise:
  Confirmed

Bug description:
  Problem:

  Brightness keys or brightness settings controls do not change the
  brightness or display as intended.

  However, If I run the following command it works perfectly:
  xrandr --output LVDS --brightness 0.5

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.5.0-23-generic 3.5.0-23.35~precise1
  ProcVersionSignature: Ubuntu 3.5.0-23.35~precise1-generic 3.5.7.2
  Uname: Linux 3.5.0-23-generic x86_64
  NonfreeKernelModules: wl
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25.
  ApportVersion: 2.0.1-0ubuntu17.1
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 1: Generic_1 [HD-Audio Generic], device 0: CONEXANT Analog [CONEXANT Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     2137 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     2137 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Generic'/'HD-Audio Generic at 0xf0544000 irq 46'
     Mixer name	: 'ATI R6xx HDMI'
     Components	: 'HDA:1002aa01,00aa0100,00100200'
     Controls      : 6
     Simple ctrls  : 1
  Card0.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Card1.Amixer.info:
   Card hw:1 'Generic_1'/'HD-Audio Generic at 0xf0540000 irq 16'
     Mixer name	: 'Conexant CX20590'
     Components	: 'HDA:14f1506e,17aa5108,00100003'
     Controls      : 20
     Simple ctrls  : 10
  Card29.Amixer.info:
   Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw unknown'
     Mixer name	: 'ThinkPad EC (unknown)'
     Components	: ''
     Controls      : 1
     Simple ctrls  : 1
  Card29.Amixer.values:
   Simple mixer control 'Console',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Date: Tue Mar 19 17:49:29 2013
  HibernationDevice: RESUME=UUID=ee9d3e8f-05df-494c-afc6-36438c39723b
  InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130213)
  MachineType: LENOVO 3469C01
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-23-generic root=UUID=5396c06a-e550-4e31-b4f5-d953a397915f ro quiet splash initcall_debug vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-23-generic N/A
   linux-backports-modules-3.5.0-23-generic  N/A
   linux-firmware                            1.79.1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/30/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: HNET14WW (1.01 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 3469C01
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrHNET14WW(1.01):bd05/30/2012:svnLENOVO:pn3469C01:pvrThinkPadEdgeE435:rvnLENOVO:rn3469C01:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 3469C01
  dmi.product.version: ThinkPad Edge E435
  dmi.sys.vendor: LENOVO

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