Comment 3 for bug 130457

I've done a little workaround to make suspend/hibernate work with the iwl3945 driver.
First of all I've put in /etc/default/acpi-support MODULES_WHITELIST="iwl3945"
Secondly I've added this script under /etc/acpi/resume.d
---
#!/bin/bash
#/etc/acpi/resume.d/99-restart-network-manager.sh

/etc/dbus-1/event.d/25NetworkManager restart
/etc/dbus-1/event.d/26NetworkManagerDispatcher restart
---

In this way NetworkManager is restarted and it reconfigure the wifi card.

It's not a good practice but it solved the problem for me.