I'm still seeing the issue in 2.6.22-12-generic (Gutsy first beta) on a Fujitsu-Siemens Lifebook T4210 (tablet PC, i945GM/Centrino Duo stuff):

- boot with killswitch on (= wireless off) and there will be no scan results when disabling killswitch, and after /etc/init.d/network reload not even wireless extensions
- unloading and reloading the module while the killswitch is disabled (=wireless on) resolves the problem for me

wildest guess: might there be something inside the ipw3945 module or deamon caching the killswitch state or not updating some internal variable properly?
Note I haven't read a single line of driver source code...

$ uname -a
Linux FORGETTHEHOSTNAME 2.6.22-12-generic #1 SMP Sun Sep 23 18:11:30 GMT 2007 i686 GNU/Linux

$ lspci -nn
00:00.0 Host bridge [0600]: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub [8086:27a0] (rev 03)
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)
00:02.1 Display controller [0380]: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller [8086:27a6] (rev 03)
00:1b.0 Audio device [0403]: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller [8086:27d8] (rev 02)
00:1c.0 PCI bridge [0604]: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 [8086:27d0] (rev 02)
00:1c.1 PCI bridge [0604]: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 [8086:27d2] (rev 02)
00:1c.2 PCI bridge [0604]: Intel Corporation 82801G (ICH7 Family) PCI Express Port 3 [8086:27d4] (rev 02)
00:1d.0 USB Controller [0c03]: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 [8086:27c8] (rev 02)
00:1d.1 USB Controller [0c03]: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 [8086:27c9] (rev 02)
00:1d.2 USB Controller [0c03]: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 [8086:27ca] (rev 02)
00:1d.3 USB Controller [0c03]: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 [8086:27cb] (rev 02)
00:1d.7 USB Controller [0c03]: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller [8086:27cc] (rev 02)
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobile PCI Bridge [8086:2448] (rev e2)
00:1f.0 ISA bridge [0601]: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge [8086:27b9] (rev 02)
00:1f.1 IDE interface [0101]: Intel Corporation 82801G (ICH7 Family) IDE Controller [8086:27df] (rev 02)
00:1f.2 SATA controller [0106]: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA AHCI Controller [8086:27c5] (rev 02)
00:1f.3 SMBus [0c05]: Intel Corporation 82801G (ICH7 Family) SMBus Controller [8086:27da] (rev 02)
02:00.0 Ethernet controller [0200]: Marvell Technology Group Ltd. 88E8055 PCI-E Gigabit Ethernet Controller [11ab:4363] (rev 12)
05:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG Network Connection [8086:4222] (rev 02)
08:03.0 CardBus bridge [0607]: O2 Micro, Inc. OZ711MP1/MS1 MemoryCardBus Controller [1217:7134] (rev 20)
08:03.1 CardBus bridge [0607]: O2 Micro, Inc. OZ711MP1/MS1 MemoryCardBus Controller [1217:7134] (rev 20)
08:03.2 Generic system peripheral [0805]: O2 Micro, Inc. Integrated MMC/SD Controller [1217:7120]
08:03.3 Bridge [0680]: O2 Micro, Inc. Integrated MS/xD Controller [1217:7130]