Hi Ben,

I've encountered the same problem with the radio hotkey not being recognised 
(although I use ndiswrapper not b43). I believe this occurs if the device is 
not active during boot, it appears as though X (which controls inputs such as 
this) does not realise the key should do anything unless the device tells it 
that it should (or some such). I believe you can send the same trigger to the 
kernel, however, by altering a file in /proc. Unfortunately I'm not sure what 
it is, as I've disabled the hotkey in my bios (which is your second option for 
getting around this). If you want to try the first option, try:
tree -f /proc | grep rfkill
It should be called rfkill, or rfkill_enable, if what I recall is correct. Then 
try using 'cat' to read the file (you'll probably have to do this as root), 
you'll get a binary value in return, 'echo' the opposite value into the file 
and see what happens.

-- 
bcm4306, bcm4309, bcm4311, bcm4312 with b43 : Authentication with AP doesn't 
work.
https://bugs.launchpad.net/bugs/182716
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