I have similar problem: I am unable to turn off the wireless device in feisty.
If it is not configured it insists on being in roaming-mode and keeps 
transmitting.
The activity shows up in the system-monitor applet, and can be followed in the 
TX-line in ifconfig. 
iwconfig ra0 power off did not work for me. My device has the following info in 
lspci:
00:0a.0 Network controller: RaLink RT2500 802.11g Cardbus/mini-PCI (rev 01)
        Subsystem: Unknown device 1948:3c02
        Flags: bus master, slow devsel, latency 32, IRQ 20
        Memory at ee000000 (32-bit, non-prefetchable) [size=8K]
        Capabilities: [40] Power Management version 2

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network-manager insists on connecting to wireless network, even if wireless 
option is disabled
https://launchpad.net/bugs/78491

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