Comment 26 for bug 420678

Update: tried more settings

GHZ | AP up to 130 Mbps setting | AP up to 300 Mbps setting
2,4 | X | X
5 | O | O

0: DOES NOT WORK, or only works for about 10 seconds and the fails, unless you set "sudo iwconfig rate 54M"
X: WORKS, iwconfig displays "Bit Rate=0 kb/s"

My conclusions:

1. AFIK not AP's fault
2. iwlagn is broken for 802.11n on 5 Ghz
3. iwconfig tool has to be updated not to display rates bigger than 54Mbit/s as 0