Comment 4 for bug 21569

"You need to run exactly the same command twice, or it doesn't work?"

Yes. I would say that nine times out of ten I get an implementation failure the first time
the command is run. I seem to remember this being pointed out on the linux-wlan mailing list
(or other documentation - Sorry, I do not remember). It is harmless to run it a second time
if it first succeeds.

Yes, the driver is in the kernel, and the prism2_usb module gets properly loaded by hotplug
for me. Nothing else, though.