This was bugging the hell out of me - every time I suspend or hibernate, when I resume the network has dropped out and network manager will not respond to bring it back.

Well there’s a solution, which I’ve posted here straight from the posting I made on the forums:

For me, turning off networking before suspend works.

sudo vi /etc/default/acpi-support

Change the line that reads:

STOP_SERVICES=””

To

STOP_SERVICES=“networking”

Worked for me and I’ve had a hell of a job getting suspend and hibernate to work properly.