Fn+F2 not work to enable/disable wifi

Function Fn+F2 to enable/disable wifi driver not work.

The solution: http://ubuntuforums.org/showthread.php?t=2181558
Not solved to me.

$ cat /sys/class/dmi/id/product_name
S550CA

$ lspci -nnk | grep -A2 0280
02:00.0 Network controller [0280]: Qualcomm Atheros AR9485 Wireless Network Adapter [168c:0032] (rev 01)
 Subsystem: Lite-On Communications Inc Device [11ad:6628]
 Kernel driver in use: ath9k

$ lsmod | grep -e ath9k -e asus
asus_nb_wmi 24576 0
asus_wmi 24576 1 asus_nb_wmi
sparse_keymap 16384 1 asus_wmi
ath9k 147456 0
ath9k_common 32768 1 ath9k
ath9k_hw 458752 2 ath9k_common,ath9k
ath 32768 3 ath9k_common,ath9k,ath9k_hw
mac80211 720896 1 ath9k
cfg80211 532480 4 ath,ath9k_common,ath9k,mac80211
wmi 20480 1 asus_wmi
video 20480 2 i915,asus_wmi

$ rfkill list all
1: phy0: Wireless LAN
 Soft blocked: no
 Hard blocked: no
2: asus-wlan: Wireless LAN
 Soft blocked: no
 Hard blocked: no
3: asus-bluetooth: Bluetooth
 Soft blocked: no
 Hard blocked: no
7: hci0: Bluetooth
 Soft blocked: no
 Hard blocked: no

$ sudo lshw -class network
[sudo] password for caio:
  *-network DESABILITADO
       descrição: Interface sem fio
       produto: AR9485 Wireless Network Adapter
       fabricante: Qualcomm Atheros
       ID físico: 0
       informações do barramento: pci@0000:02:00.0
       nome lógico: wlan0
       versão: 01
       serial: 5c:c9:d3:42:0a:f6
       largura: 64 bits
       clock: 33MHz
       capacidades: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
       configuração: broadcast=yes driver=ath9k driverversion=3.19.0-59-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
       recursos: irq:17 memória:f7d00000-f7d7ffff memória:f7d80000-f7d8ffff
  *-network
       descrição: Ethernet interface
       produto: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       fabricante: Realtek Semiconductor Co., Ltd.
       ID físico: 0.2
       informações do barramento: pci@0000:03:00.2
       nome lógico: eth0
       versão: 0a
       serial: 78:24:af:ba:6d:71
       tamanho: 100Mbit/s
       capacidade: 1Gbit/s
       largura: 64 bits
       clock: 33MHz
       capacidades: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuração: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8411-1_0.0.3 06/18/12 ip=192.168.4.51 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
       recursos: irq:28 porta de E/S:e000(tamanho=256) memória:f7c10000-f7c10fff memória:f0000000-f0003fff

$ sudo nm-tool

NetworkManager Tool

State: connected (global)

- Device: eth0 -----------------------------------------------------------------
  Type: Wired
  Driver: r8169
  State: unmanaged
  Default: no
  HW Address: 78:24:AF:BA:6D:71

  Capabilities:
    Carrier Detect: yes
    Speed: 100 Mb/s

  Wired Properties
    Carrier: on

- Device: wlan0 ----------------------------------------------------------------
  Type: 802.11 WiFi
  Driver: ath9k
  State: unmanaged
  Default: no
  HW Address: 5C:C9:D3:42:0A:F6

  Capabilities:

  Wireless Properties
    WEP Encryption: yes
    WPA Encryption: yes
    WPA2 Encryption: yes

  Wireless Access Points

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.19.0-59-generic 3.19.0-59.65~14.04.1
ProcVersionSignature: Ubuntu 3.19.0-59.65~14.04.1-generic 3.19.8-ckt19
Uname: Linux 3.19.0-59-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: Unity
Date: Thu May 12 13:45:33 2016
InstallationDate: Installed on 2016-01-27 (106 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: linux-lts-vivid
UpgradeStatus: No upgrade log present (probably fresh install)