Affects me too, looking for older bugs i found one on 13.03 that looks similar: 
Bug #1184262 
My working bypass is to issue a "sudo killall NetworkManager" after resuming 
and this works again (trying just to touch the sleep parameter does nt fix the 
problem)
I use a Lenovo X220 with i5

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https://bugs.launchpad.net/bugs/1295285

Title:
  Wi-Fi or Networking stop working after suspend/resume (failure) Ubuntu
  14.04

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