Lenovo Ideapad U550: wireless was softblocked by acer_wmi. sudo rmmod acer_wmi 
and adding it to /etc/modprobe.d/blacklist.conf fixed the issue. However, after 
working for a week (was there a kernel update in proposed?) wireless died 
again, now with hardblocked state.
Following steps fixed this:
1) removing acer_wmi form /etc/modprobe.d/blacklist.conf
2) rebooting
3) rfkill unblock all
4) sudo rmmod acer_wmi

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https://bugs.launchpad.net/bugs/771758

Title:
  acer-wmi prevents wifi (bcmwl/brcm80211) from working

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