Comment 13 for bug 1027202

I have a workaround that isn't particularly elegant but does the trick for me: have the NetworkManager automatically restart at resume.

1. add file to /etc/pm/sleep.d/ , e.g. call it 99_restart-network-manager, and make it executable
2. in the file, put
#!/bin/bash

case "${1}" in
    resume|thaw)
 restart network-manager
;;
esac