Comment 32 for bug 1286552

I have an Asus X61SL laptop suffering from the same problem and I solved like this:
First use 'nmcli nm' to check the stats of the network manager, if its stats is asleep then all you have to do is this : 'sudo nmcli nm sleep false' and it will start working. To make the change permenant add the following script to '/etc/pm/sleep.d':

#!/bin/sh

case "${1}" in
        resume|thaw)
  nmcli nm sleep false
                ;;
esac