Lenovo X220, freebsd 10.2 settings wireless 6205

loader.conf

iwnfw_load="YES"
if_iwn_load="YES"
iwn6050="YES"
legal.intel_iwn.license_ack=1
wlan_ccmp_load="YES"
wlan_tkip_load="YES"
##semaphore
#sem_load="YES"

#aesni_load="YES"

# Enable power saving modes for the Intel i915 chipset
drm.i915.enable_rc6=7
kern.maxfiles="25000"
hw.psm.synaptics_support="1"
~                                  

rc.conf

wlans_iwn0="wlan0"
# -ht fixed the frequent disconnects
ifconfig_wlan0="-ht WPA SYNCDHCP"
hostname="dodong"
sshd_enable="YES"
moused_enable="YES"
powerd_enable="YES"
# Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable
dumpdev="NO"
dbus_enable="YES"
hald_enable="YES"
sendmail_enable="NONE"
sendmail_msp_queue_enable="NO"
sendmail_outbound_enable="NO"
sendmail_submit_enable="NO"
performance_cx_lowest="C2"
economy_cx_lowest="C2"
slim_enable="YES"