Looking at your dmesg output it seems your killswitch is enabled:
[ 12.332096] iwl3945: Radio Frequency Kill Switch is On:
[ 12.332099] Kill switch must be turned off for wireless networking to work.
Please disable and retest. Thanks.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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[Jaunty] Wireless networks not detected on a Quanta SW1 laptop
https://bugs.launchpad.net/bugs/364914
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