Comment 11 for bug 492657

arno: The hotfix would be to put the following line in the file /etc/udev/rules.d/96-bluetooth-hotkey.rules (doesn't exist, you have to create it with this line):
ENV{DMI_VENDOR}=="Acer*", ATTR{[dmi/id]product_name}=="TravelMate*8571*", RUN+="keymap $name 0xD9 bluetooth"

I didn't search for any options to turn it off, I just put the following snippet in /etc/rc.local:
for rfkill in /sys/class/bluetooth/hci*/rfkill*/state; do
  [ -f $rfkill ] && echo 0 > $rfkill
done

This has the same effect as if you pressed the bluetooth switch on startup.