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[Pilot6 <1400068@xxxxxxxxxxxxxxxxxx>]

Yes, I am the original reporter. The problem is a bit complex.

My "acpi_osi=" solution used to work, until Aaron made that DOD commit.
Now the brightness keys do not create events at all in 3.18 kernel.

He needs to fix that first. Regarding Ubuntu kernel, the patch works.

You can see commits in my tiny fork.

https://github.com/hanipouspilot/ubuntu-fixes/tree/pilot6

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https://bugs.launchpad.net/bugs/1400068

Title:
  [ASUS X200MA] Brightness keys do not work

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Brightnes keys Fn+F5 and F6 do not work. This is fixed by adding "acpi_osi=" kernel option.
  This is also reported on other ASUS models.
  Information can be also found here.

  https://bugzilla.kernel.org/show_bug.cgi?id=7024

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.16.0-25-generic 3.16.0-25.33~14.04.2
  ProcVersionSignature: Ubuntu 3.16.0-25.33~14.04.2-generic 3.16.7
  Uname: Linux 3.16.0-25-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Dec  7 15:22:27 2014
  InstallationDate: Installed on 2014-10-31 (37 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  SourcePackage: linux-lts-utopic
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  pilot6     1930 F.... pulseaudio
  CurrentDesktop: Unity
  CurrentDmesg:
   [   35.096232] init: plymouth-upstart-bridge main process ended, respawning
   [   41.464895] init: anacron main process (1153) killed by TERM signal
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=2f501090-6091-423c-abb1-a09f9c524fc3
  InstallationDate: Installed on 2014-10-31 (38 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  Lsusb:
   Bus 001 Device 005: ID 13d3:3408 IMC Networks 
   Bus 001 Device 004: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
   Bus 001 Device 003: ID 0bda:5603 Realtek Semiconductor Corp. 
   Bus 001 Device 002: ID 8087:07e6 Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. X200MA
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic.efi.signed root=UUID=8b0c6000-31d7-4e41-bfbf-4149ad0122d4 ro quiet splash acpi_osi= acpi.debug_layer=0x10000000 acpi.debug_level=4 vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-25.33~14.04.2-generic 3.16.7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-25-generic N/A
   linux-backports-modules-3.16.0-25-generic  N/A
   linux-firmware                             1.127.10
  Tags:  trusty
  Uname: Linux 3.16.0-25-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 09/11/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X200MA.502
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X200MA
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX200MA.502:bd09/11/2014:svnASUSTeKCOMPUTERINC.:pnX200MA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX200MA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X200MA
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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