I am also experiencing this issue. It started just recently.
On Dell D630 with wireless switch off:
rfkill list
0: dell-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
with wireless on:
rfkill list
0: dell-wifi: Wireless LAN
Soft blocked: no
Hard blocked: yes
Linux 2.6.32-23-generic #37-Ubuntu SMP Fri Jun 11 08:03:28 UTC 2010
x86_64 GNU/Linux
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Wireless switch position not properly detected
https://bugs.launchpad.net/bugs/588366
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