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
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https://bugs.launchpad.net/bugs/1311257
Title:
Wifi cannot connect or unstable after suspend 14.04
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