Problems setting the sensitivity (sens) with iwconfig

[Victor Aleo]

Hi all,

Is it possible to set the sensitivity with the Prism2 (Prism2-2002-05-1) 
driver using the iwconfig? Thus, when I exec:

# iwconfig wlan0 sens -40

Error for wireless request "Set Sensitivity" (8B08) :
SET failed on device wlan0 ; Invalid argument.

I have read the man page of iwconfig and I think what I do is correct. 
It happens the same with positive values as an argument.

Any idea what is happening?

Thanks,

-- 
Victor