Comment 13 for bug 1311257

Same problem here, Ubuntu 14.04, fresh install on a new Lenovo Y50.

This was the only workaround that helped me. I don't know if some of these lines are unnecessary, but only using all of them it works.

#!/bin/sh

case "${1}" in
 resume|thaw)
 nmcli nm sleep false
 modprobe -rv iwldvm iwlwifi
 modprobe -v iwlwifi
 modprobe -v iwldvm
 killall wpa_supplicant
 dhclient -r wlan0
  dhclient wlan0
 nmcli nm sleep false
  ;;
esac