I have the same issue. Upgraded 12.04 to 14.04 on a Lenovo T530.
Killing wpa_supplicant resolves the issue, so I wrote the following
script which seems to work:
Put it in /etc/pm/sleep.d/wpa_supplicant_workaround :
#!/bin/sh
case "$1" in
resume|thaw)
killall wpa_supplicant
;;
esac
Not really ideal, but it saves a bit of typing at each resume.
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https://bugs.launchpad.net/bugs/1311257
Title:
Wifi cannot connect or unstable after suspend 14.04
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