For me dmesg look like:

1. System booted. WLAN led lights on. Network manager discovers WLANs.

2. I press WLAN button WLAN led lights off.
3. Then I immidiately press it again.
 
WLAN led lights on. Network manager continue to discover WLANs.
dmesg looks like:
[  101.771416] iwl3945: Radio Frequency Kill Switch is On:
[  101.771420] Kill switch must be turned off for wireless networking to work.
[  102.582424] Registered led device: iwl-phy0:radio
[  102.582507] Registered led device: iwl-phy0:assoc
[  102.582544] Registered led device: iwl-phy0:RX
[  102.582578] Registered led device: iwl-phy0:TX

5. I can repeat steps 2-3 many times and it will works well.

6. But, if I try to repeat steps 2-3 in other way, but i wait for some time 
(about 5 seconds) beetween step 2 and step  3, and when i press WLAN button 
WLAN led turns off, but when i press it again it does not
turns back on again.
dmesg looks like:
[  133.961713] iwl3945: Radio Frequency Kill Switch is On:
[  133.961717] Kill switch must be turned off for wireless networking to work.
[  134.954314] iwl3945: MAC is in deep sleep!
[  134.954451] iwl3945: MAC is in deep sleep!
[  134.954545] iwl3945: MAC is in deep sleep!
[  134.961569] iwl3945 0000:05:00.0: PCI INT A disabled
and I can't work with WLANs

-- 
iwl3945 | iwl4965: Wireless can't be activated after disabling kill switch
https://bugs.launchpad.net/bugs/193970
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