I investigated unloading network modules prior and reloading after a
suspend operation. Hereby, I modified following file:

/etc/default/acpi-support

and added iwl4965 iwlwifi_mac80211 cfg80211 to the MODULES part:

MODULES="iwl4965 iwlwifi_mac80211 cfg80211"

With this, I managed to get the wireless working after a suspend
operation. However, it worked only once. The many other times I tried,
the network was frozen after suspend anyway.

I hope that a solution can be found for this problem and updated driver
will be backported soon for Gutsy Gibbon.

For now I am back to using ndiswrapper that works mostly. However, it
gave me occasional freezes  and often CPU softlocks during booting in
the past. So this is not a solution either.

-- 
iwl4965 does not work after resume
https://bugs.launchpad.net/bugs/146191
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