Please provide dmesg and acpidump.

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  Brightness control keys not working on Gigabyte P57 laptop

Status in linux package in Ubuntu:

Bug description:
  I have a gigabyte P57 laptop running Ubuntu 16.04 kernel 4.8.x. My
  brightness control keys (fn+F3, fn+F4) are not getting detected. After
  reading about how keypresses are handled by the Linux kernel, I used
  showkey to check the scancodes of these keys. I did not get any
  output. Similarly no output from xev, evtest and acpi_listen.

  Just for your reference, other keys like volume up (fn+F9) are working 
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2016-12-14 (65 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  Package: linux (not installed)
  Tags:  xenial
  Uname: Linux 4.8.0-040800-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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