Dear Christopher, thanks for your feedback. Following your suggestion I
upgraded to the latest BIOS version provided by Lenovo, here is the
output from this 'sudo dmidecode -s bios-version && sudo dmidecode -s
bios-release-date' line:

8DET70WW (1.40 )
05/14/2015

Sadly, there was no improvement on the bug, I still get situations where
my laptop won't connect top WLAN and will refuse any attempts to force
it to short of a reboot.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1584533

Title:
  Lenovo X220 unable to wlan after resume from sleep

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