I'm using Ubuntu 13.04 and I have ASUS X550V laptop. This is my rfkill list:

0: asus-wlan: Wireless LAN

    Soft blocked: no

    Hard blocked: no

1: asus-bluetooth: Bluetooth

    Soft blocked: no

    Hard blocked: no

2: phy0: Wireless LAN

    Soft blocked: no

    Hard blocked: yes

3: hci0: Bluetooth

    Soft blocked: no

    Hard blocked: no

Before you start going: Hey, just turn on your hardware switch, dummy... my hardware switch is Fn + F2 and it works perfectly fine on my Windows boot.
But, on my Ubuntu boot it does nothing... All the other Fn + F_ combos work (turn off the touchpad, screen turn off, screen brightness, sound) and they give some kind of visual indicator when I press it.

My lshw log:

*-network DISABLED

                description: Wireless interface

                product: AR9485 Wireless Network Adapter

                vendor: Atheros Communications Inc.

                physical id: 0

                bus info: pci@0000:03:00.0

                logical name: wlan0

                version: 01

                serial: 24:0a:64:28:b4:25

                width: 64 bits

                clock: 33MHz

                capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless

                configuration: broadcast=yes driver=ath9k driverversion=3.8.0-19-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn

                resources: irq:17 memory:f7900000-f797ffff memory:f7980000-f798ffff