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I have found that iwl3945 will not offer weak signals for connection whereas ndiswrapper with the appropriate 3945ABG driver will offer signals as weak as 1% in Wicd and Network Manager. I figure that this isn't a proper behavior since the signals that ndiswrapper picks up are already 10% weaker than those of iwl3945. See launchpad entry for logs. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/705921
I'm still plan to look at that problem ...
[mass update] kernel-3.3.0-4.fc16 has been pushed to the Fedora 16 stable repository. Please retest with this update.
Apparently this bug is not fixed, but I do not have time to fix it, and this is not quite important issue, closing with wantfix.