This bug was "fixed" by re-installing Ubuntu 16.04.3 (downloaded from a few days ago).

The buttons did not work initially when I installed the original 16.04
LTS version released in April 2016, so I'm guessing that version of the
kernel did not have that fix.

The current version of the kernel used in 16.04.3 fixed this issue. So
the bug should probably be with the upgrade mechanism of the kernel.

Thank you.

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  Some function keys not working

Status in linux package in Ubuntu:

Bug description:
  I have an ASUS UX305C laptop, and some of the function keys do not

  The keys in question:

  fn - airplane mode (f2)
  fn - brightness down (f5)
  fn - brightness up (f6)

  I followed the troubleshooting guide at with the following results:

  1. acpi_listen gives no output when those keys are pressed
  2. xev gives no output when those keys are pressed

  The keys work on Windows 10. On a more recent version of the similar
  laptop UX430UA-DH74, using the same version of Ubuntu 16.04.3, the
  same keys work properly.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-112-generic 4.4.0-112.135
  ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
  Uname: Linux 4.4.0-112-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
   /dev/snd/controlC0:  lev        2926 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Feb 10 11:47:39 2018
  HibernationDevice: RESUME=UUID=4a4d8024-561e-4d5e-882c-9f75d26c69fd
  InstallationDate: Installed on 2016-09-11 (516 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
   Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] 
failed with exit code 1: Hint: You are currently not seeing messages from other 
users and the system.
         Users in the 'systemd-journal' group can see all messages. Pass -q to
         turn off this notice.
   No journal files were opened due to insufficient permissions.
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 8087:0a2a Intel Corp. 
   Bus 001 Device 002: ID 064e:9700 Suyin Corp. Asus Integrated Webcam
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-112-generic.efi.signed 
root=UUID=ce463230-5723-4211-9d44-d18e3f30c695 ro quiet splash vt.handoff=7
   linux-restricted-modules-4.4.0-112-generic N/A
   linux-backports-modules-4.4.0-112-generic  N/A
   linux-firmware                             1.157.15
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog: 09/11/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: UX305CA.201
  dmi.board.asset.tag: ATN12345678901234567 UX305CA
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
dmi:bvnAmericanMegatrendsInc.:bvrUX305CA.201:bd09/11/2015:svnASUSTeKCOMPUTERINC.:pnUX305CA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX305CA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0: UX305CA
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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