It seems that dell-laptop.c removed rfkill code in kernel 3.11.10
After that, rfkill code added back and whitelisted Latitude models with 
following 2 patches.
--
commit 4cc8a57425c623753b10b77b15392e5b83baa5a3
Author: Hans de Goede <hdego...@redhat.com>
Date:   Sun Nov 17 14:00:16 2013 +0100

    Revert "dell-laptop: Remove rfkill code"
--
commit 2a92551845bbbc8421ba908cd14bbdf065e0f454
Author: Hans de Goede <hdego...@redhat.com>
Date:   Sun Nov 17 14:00:17 2013 +0100

    dell-laptop: Only enable rfkill on Latitudes


I will test these 2 patches after getting the machine to see if it is the root 
cause of this issue.

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https://bugs.launchpad.net/bugs/1278319

Title:
  [Dell Latitude E7240] Wifi slider does not work.

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