Radio Frequency Kill Switch is On ( Acer Wireless Stops Working )

Today I opened up my three year old acer 3002wlmi laptop to vacuum all the dust out of it in a vain attempt to make the fan a little quieter and the box to run a little less hot.

The vacuuming semi successful I turn the box back on, running Ubuntu 7.10 (Feisty), only to find that the wireless networking is not recognized. The horror of life without internet suddenly struck me. However I found in my bag of bits and old Netgear USB wireless stick. I didn't have much faith in it working but I plugged it in and it worked immediately.

However how to get my built-in wireless working. I ran dmesg and found the following.

[  124.663287] ipw2200: Radio Frequency Kill Switch is On:
[  124.663290] Kill switch must be turned off for wireless networking to work.

After nosing around the newsgroups I ended up running the following commands.
mod ipw2200

sudo rmmod ipw2200
sudo modprobe fsam7400
sudo su
sudo modprobe ipw2200
echo_ "1" > /proc/driver/wireless/radio
exit

Not sure if I needed all the above. The line starting "echo" is definitely needed as that is what is started the wireless radio again.

Now all is working again but the fan still runs loud and the box is hot.

Update

The above all gets cleared on reboot. To make it permanent
do.

sudo echo_ fsam7400 >> /etc/modules
sudo echo_ options fsam7400 radio=1 >> etc/modprob.d/options