There were some improvements for iwl3945 driver in intrepid.
if you still see this with latest ubuntu (intrepid), please reopen and
attach your complete syslog taken after reproducing.
** Changed in: network-manager (Ubuntu)
Status: Incomplete = Invalid
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IWL3945 driver does not work
Thank you for taking the time to report this bug and helping to make
Ubuntu better. Unfortunately we can't start working on it yet, because
your bug report didn't include enough information.
Please include the information requested at
https://wiki.ubuntu.com/DebuggingNetworkManager. If you have