Uso:
sudo touch /etc/pm/sleep.d/network-manager-resume
sudo chmod +x /etc/pm/sleep.d/network-manager-resume
sudo nano /etc/pm/sleep.d/network-manager-resume
Cole o seguinte e salve o arquivo. Isso traz o NetworkManager fora do modo de suspensão:
#!/bin/sh
# This script gets NetworkManager out of suspend.
case $1 in
suspend|suspend_hybrid|hibernate)
# No need to do anything here.
;;
resume|thaw)
nmcli nm sleep false
;;
esac
Fonte : link