Comment 89 for bug 430809

But still, WICD was not able to detect wireless and could able to scan the network only when network-manager was also present. One more weird thing was, wicd able to scan and detect wireless connections only when I connected the system with eth0 cable. < a class="sprite download-icon" href="https://play.google.com/store/apps/details?id=com.CRE8.LudoChat">ludo</a>
Also tried by doing:
sudo rmmod -f iwl3945
sudo modprobe iwl3945 disable_hw_scan=1

But it also not worked for me.