I get the problem as described on Ubuntu 12.04, with a Sony Vaio SVS15116 
laptop, and wifi (from lspci):
02:00.0 Network controller: Intel Corporation Centrino Advanced-N 6235 (rev 24)

Every time I manually uncheck "enable wireless" from the networking menu
(default unity setup), it stays greyed out. Sending "sudo rfkill unblock
all" then disable/reenable networking, it is fixed.

While broken, "rfkill list all" gives:

0: sony-wifi: Wireless LAN
        Soft blocked: yes
        Hard blocked: no
1: sony-bluetooth: Bluetooth
        Soft blocked: no
        Hard blocked: no
2: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no
3: phy0: Wireless LAN
        Soft blocked: yes
        Hard blocked: yes

The laptop has NO hardware wireless switch, and NO function key
combination for wifi (they rely on a proprietary program in windows to
manage wireless... yuck).

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https://bugs.launchpad.net/bugs/977639

Title:
  NetworkManager erroneously reports iwlwifi as "disabled by hardware
  switch"

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