Unable to search for networks with intel 2915 (iwi driver)

Hi,

I was able to search for networks with dstumbler on FreeBSD 5.x, but now 
it doesn't work with 6.0-RC1. My wireless card is an Intel 2915 and I am 
using the iwi driver. I have also tried ndis. With both I get the same 
error when I run dstumbler:

error: unable to ioctl device socket: Invalid argument

Thanks!

Pierre-Luc Drouin