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[Bug 1409625] [NEW] [HP EliteBook 725 G2 Notebook PC] brightness could not be controlled by the function key and the slider of "System settings -> Brightness and Lock" but sysfs works

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Public bug reported:

HP EliteBook 725 G2 Notebook PC
(CID 201405-15214)
updated Ubuntu 14.04.1
3.13.0-43-generic #72

Steps to reproduce the bug:
1. install 12.04.3 on this machine
2. update the system via update manager to make the system up-to-date
3. click the upper-right indicator to launch the "System settings -> Brightness and Lock" applet
4. try to adjust the brightness slider to control the brightness
5. try to adjust the brightness by the function key fn+F8 or fn+F9

Expected result:
The brightness could be adjusted

Actual result:
screen brightness has no response

More information:
brightness has no response by using this command:
echo 4 | sudo tee -a /sys/class/backlight/acpi_video0/brightness

brightness HAS response by using this command:
echo 4 | sudo tee -a /sys/class/backlight/radeon_bl0/brightness

------------------------

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-43-generic 3.13.0-43.72
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  ubuntu     1417 F.... pulseaudio
 /dev/snd/controlC0:  ubuntu     1417 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon Jan 12 02:50:55 2015
HibernationDevice: RESUME=UUID=e24b803a-e217-4d6d-a35c-dbe0c033966a
InstallationDate: Installed on 2015-01-08 (3 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
IwConfig:
 eth0      no wireless extensions.
 
 lo        no wireless extensions.
MachineType: Hewlett-Packard HP Licrice
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic root=UUID=c1e0a265-8c75-4427-ad25-f0c76f003ce7 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-43-generic N/A
 linux-backports-modules-3.13.0-43-generic  N/A
 linux-firmware                             1.127.11
RfKill:
 0: hci0: Bluetooth
 	Soft blocked: no
 	Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/03/2014
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: M84 Ver. 97.35
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 221D
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 63.14
dmi.chassis.asset.tag: 73612P10CU
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvrM84Ver.97.35:bd09/03/2014:svnHewlett-Packard:pnHPLicrice:pvrA3009CD10002:rvnHewlett-Packard:rn221D:rvrKBCVersion63.14:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP Licrice
dmi.product.version: A3009CD10002
dmi.sys.vendor: Hewlett-Packard

** Affects: hwe-next
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 201405-15214 amd64 apport-bug blocks-hwcert taipei-lab trusty

** Also affects: hwe-next
   Importance: Undecided
       Status: New

-- 
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/1409625

Title:
  [HP EliteBook 725 G2 Notebook PC] brightness could not be controlled
  by the function key and the slider of "System settings -> Brightness
  and Lock" but sysfs works

Status in HWE Next Project:
  New
Status in linux package in Ubuntu:
  New

Bug description:
  HP EliteBook 725 G2 Notebook PC
  (CID 201405-15214)
  updated Ubuntu 14.04.1
  3.13.0-43-generic #72

  Steps to reproduce the bug:
  1. install 12.04.3 on this machine
  2. update the system via update manager to make the system up-to-date
  3. click the upper-right indicator to launch the "System settings -> Brightness and Lock" applet
  4. try to adjust the brightness slider to control the brightness
  5. try to adjust the brightness by the function key fn+F8 or fn+F9

  Expected result:
  The brightness could be adjusted

  Actual result:
  screen brightness has no response

  More information:
  brightness has no response by using this command:
  echo 4 | sudo tee -a /sys/class/backlight/acpi_video0/brightness

  brightness HAS response by using this command:
  echo 4 | sudo tee -a /sys/class/backlight/radeon_bl0/brightness

  ------------------------

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-43-generic 3.13.0-43.72
  ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
  Uname: Linux 3.13.0-43-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     1417 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     1417 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Jan 12 02:50:55 2015
  HibernationDevice: RESUME=UUID=e24b803a-e217-4d6d-a35c-dbe0c033966a
  InstallationDate: Installed on 2015-01-08 (3 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Hewlett-Packard HP Licrice
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-43-generic root=UUID=c1e0a265-8c75-4427-ad25-f0c76f003ce7 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-43-generic N/A
   linux-backports-modules-3.13.0-43-generic  N/A
   linux-firmware                             1.127.11
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/03/2014
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: M84 Ver. 97.35
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 221D
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 63.14
  dmi.chassis.asset.tag: 73612P10CU
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrM84Ver.97.35:bd09/03/2014:svnHewlett-Packard:pnHPLicrice:pvrA3009CD10002:rvnHewlett-Packard:rn221D:rvrKBCVersion63.14:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP Licrice
  dmi.product.version: A3009CD10002
  dmi.sys.vendor: Hewlett-Packard

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