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[Catalin <codreanu.catalin@xxxxxxxxx>]

I did some more testing and I nailed the change to the 3.15.7 kernel update.
I must have confused versions in my initial report.

Anyways, looking throught the changelog for that kernel version I found
this changeset :

commit be907c8468c9f47882036109ba550cd2748b86a0
Author: Alex Deucher <alexander.deucher@xxxxxxx>
Date:   Tue Jul 15 09:48:53 2014 -0400

    drm/radeon: set default bl level to something reasonable
    
    commit 201bb62402e0227375c655446ea04fcd0acf7287 upstream.
    
    If the value in the scratch register is 0, set it to the
    max level.  This fixes an issue where the console fb blanking
    code calls back into the backlight driver on unblank and then
    sets the backlight level to 0 after the driver has already
    set the mode and enabled the backlight.
    
    bugs:
    https://bugs.freedesktop.org/show_bug.cgi?id=81382
    https://bugs.freedesktop.org/show_bug.cgi?id=70207
    
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Tested-by: David Heidelberger <david.heidelberger@xxxxxxx>
    Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

This modified the way the radeon module handles default backlight values.
Looking through the first bug report I found out about the "radeon.backlight" kernel option.
Adding "radeon.backlight=0" to grub command line fixed the display brightness issue.

** Bug watch added: freedesktop.org Bugzilla #81382
   https://bugs.freedesktop.org/show_bug.cgi?id=81382

** Bug watch added: freedesktop.org Bugzilla #70207
   https://bugs.freedesktop.org/show_bug.cgi?id=70207

** Also affects: xserver-xorg-driver-radeonhd via
   https://bugs.freedesktop.org/show_bug.cgi?id=81382
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1363623

Title:
  [ASUS-A7K laptop] screen brightness dimmed after kernel update

Status in xserver-xorg-driver-radeonhd:
  Unknown
Status in “xorg” package in Ubuntu:
  New

Bug description:
  Hello,

  Following the update from kernel version 3.13.0-34 to 3.13.0-35-generic the screen brightness got a lot dimmer.
  The Fn+F5/F6 control keys still work, in that the display gets dimmer and brighter, but the maximum brightness is too low.
  When starting ubuntu using the previous kernel release the display brightness is alright.
  I've looked around the web for ways to change the display brightness and I checked that both files "/sys/class/backlight/acpi_video0/brightness" and "/sys/class/backlight/radeon_bl0/brightness" have the maximum values, 15 and 255 respectively.

  The release I am running is : Ubuntu 14.04.1 LTS
  The XORG package version is : 1:7.7+1ubuntu8

  Please feel free to contact me for any further information.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Sun Aug 31 11:40:07 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] RV630/M76 [Mobility Radeon HD 2600] [1002:9581] (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:1562]
  InstallationDate: Installed on 2014-07-24 (38 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: ASUSTeK Computer Inc. A7K
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-35-generic root=/dev/mapper/vg_a7k-lv_root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/25/2007
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: A7KAS.2
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: A7K
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrA7KAS.2:bd07/25/2007:svnASUSTeKComputerInc.:pnA7K:pvr1.0:rvnASUSTeKComputerInc.:rnA7K:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr:
  dmi.product.name: A7K
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.
  version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Sun Aug 31 11:06:06 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.15.1-0ubuntu2
  xserver.video_driver: radeon

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