I suspect this issue may be due to the following commit, which got reverted later in 3.13:
commit a6c2390cd6d2083d27a2359658e08f2d3df375ac Author: Matthew Garrett <m...@redhat.com> AuthorDate: Fri Jun 1 12:46:56 2012 -0400 dell-laptop: Remove rfkill code -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1219652 Title: [Dell Latitude 3330] Wireless key does not work. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1219652/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs