Hi Dan, Thanks for the prompt reply. The Fedora 12 Linux PC (X86) is running with kernel 2.6.31.5 . And, the embedded device is 2.6.32.16 . Thanks for the info on where the calculation is actually done. I can look in the mac80211 code to see if there is a difference. Regards Nick -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html