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[Jeremie Tamburini <jeremie.tamburini@xxxxxxxxx>]

Public bug reported:

(Fujitsu Lifebook A512 - Ubuntu 14.04 - Linux 3.13.0-24-generic  x86_64)

Pressing Fn+F6 or Fn+F7 the brightness doesn't change.


WORKAROUND (found here http://ubuntuforums.org/showthread.php?t=2192471)

1) The command:
for i in /sys/class/backlight/*; do echo $i;cat $i/brightness;cat $i/max_brightness;done

shows this output:
/sys/class/backlight/acpi_video0
1
100
/sys/class/backlight/intel_backlight
4882
4882

2) Then I've created the /usr/share/X11/xorg.conf.d/20-intel.conf file
to set the "intel_backlight" interfece, with the following lines:

Section "Device"
        Identifier "card0"
        Driver "intel"
        Option "Backlight" "intel_backlight"
        BusID "PCI:0:2:0"
EndSection

This makes the brightness shortcuts Fn+F6 and Fn+F7 work.


EXTRA INFOS
- I run "ubuntu-bug linux" on a new installation of the 14.04 in order to get informations of the original setup of the system. The workaround has been tried on another 14.04 installation on the same computer.
- I didn't install any extra packages. Everything we need to make the hot keys Fn+F6/Fn+F7 work is already in the system. It seems to be a "setup problem".. maybe related to backlight or xorg..
- The lines in /usr/share/X11/xorg.conf.d/20-intel.conf are just a copy/paste taken from the ubuntuforums.org topic. I've just tried to use it and luckily it worked.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-24-generic 3.13.0-24.47
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  pinguinux   1731 F.... pulseaudio
CurrentDesktop: Unity
Date: Sun May 11 10:21:22 2014
HibernationDevice: RESUME=UUID=f6e9afa5-5b2f-4c3d-af00-aff1122b6fe6
InstallationDate: Installed on 2014-04-18 (22 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: FUJITSU LIFEBOOK A512
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=1cd50414-50f8-4f1c-9133-e7f3375c0415 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-24-generic N/A
 linux-backports-modules-3.13.0-24-generic  N/A
 linux-firmware                             1.127
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/23/2013
dmi.bios.vendor: FUJITSU // Phoenix Technologies Ltd.
dmi.bios.version: Version 1.16
dmi.board.name: FJNBB29
dmi.board.vendor: FUJITSU
dmi.chassis.type: 10
dmi.chassis.vendor: FUJITSU
dmi.modalias: dmi:bvnFUJITSU//PhoenixTechnologiesLtd.:bvrVersion1.16:bd10/23/2013:svnFUJITSU:pnLIFEBOOKA512:pvr:rvnFUJITSU:rnFJNBB29:rvr:cvnFUJITSU:ct10:cvr:
dmi.product.name: LIFEBOOK A512
dmi.sys.vendor: FUJITSU

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


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1318299

Title:
  Fujitsu Lifebook A512 - Brightness hot keys Fn+F6/Fn+F7 don't work out
  of the box

Status in “linux” package in Ubuntu:
  New

Bug description:
  (Fujitsu Lifebook A512 - Ubuntu 14.04 - Linux 3.13.0-24-generic
  x86_64)

  Pressing Fn+F6 or Fn+F7 the brightness doesn't change.

  
  WORKAROUND (found here http://ubuntuforums.org/showthread.php?t=2192471)

  1) The command:
  for i in /sys/class/backlight/*; do echo $i;cat $i/brightness;cat $i/max_brightness;done

  shows this output:
  /sys/class/backlight/acpi_video0
  1
  100
  /sys/class/backlight/intel_backlight
  4882
  4882

  2) Then I've created the /usr/share/X11/xorg.conf.d/20-intel.conf file
  to set the "intel_backlight" interfece, with the following lines:

  Section "Device"
          Identifier "card0"
          Driver "intel"
          Option "Backlight" "intel_backlight"
          BusID "PCI:0:2:0"
  EndSection

  This makes the brightness shortcuts Fn+F6 and Fn+F7 work.

  
  EXTRA INFOS
  - I run "ubuntu-bug linux" on a new installation of the 14.04 in order to get informations of the original setup of the system. The workaround has been tried on another 14.04 installation on the same computer.
  - I didn't install any extra packages. Everything we need to make the hot keys Fn+F6/Fn+F7 work is already in the system. It seems to be a "setup problem".. maybe related to backlight or xorg..
  - The lines in /usr/share/X11/xorg.conf.d/20-intel.conf are just a copy/paste taken from the ubuntuforums.org topic. I've just tried to use it and luckily it worked.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.47
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  pinguinux   1731 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun May 11 10:21:22 2014
  HibernationDevice: RESUME=UUID=f6e9afa5-5b2f-4c3d-af00-aff1122b6fe6
  InstallationDate: Installed on 2014-04-18 (22 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: FUJITSU LIFEBOOK A512
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=1cd50414-50f8-4f1c-9133-e7f3375c0415 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/23/2013
  dmi.bios.vendor: FUJITSU // Phoenix Technologies Ltd.
  dmi.bios.version: Version 1.16
  dmi.board.name: FJNBB29
  dmi.board.vendor: FUJITSU
  dmi.chassis.type: 10
  dmi.chassis.vendor: FUJITSU
  dmi.modalias: dmi:bvnFUJITSU//PhoenixTechnologiesLtd.:bvrVersion1.16:bd10/23/2013:svnFUJITSU:pnLIFEBOOKA512:pvr:rvnFUJITSU:rnFJNBB29:rvr:cvnFUJITSU:ct10:cvr:
  dmi.product.name: LIFEBOOK A512
  dmi.sys.vendor: FUJITSU

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