I have a Lenovo ThinkPad X230 with the Centrino Advanced-N 6205 card. I've got FreeBSD 12.0-CURRENT installed and I can successfully connect to my home WiFi on the 5 GHz band. However, I'm noticing that there is a significant performance hit to my Internet speeds.
When I had a Linux distro...
I have a dell latitude d830 laptop with an intel pro/wireless 4965 wifi card. With windows 7 and with debian gnu/linux I had data transfer rates into the internet at around 240 kB/s (the maximum my provider offers here).
Unfortunately there was a serious hard disc crash so I replaced...
I have Centrino Wireless-N 2230 adapter which worked well on 10.X. On 11.0 I experienced a lot of problems with it.
Sometimes, on boot, I see something like this:
iwn0: scan timeout
iwn0: iwn_read_firmware: ucode rev=0x12a80601
wlan0: link state changed to UP
iwn0: iwn_intr: fatal firmware...
Sorry if this is a little choppy, I pieced together two different discussions I had on the mailinglist.
I currently have all the iwn options enabled(that im aware of) and built into the kernel.
In my /etc/rc.conf file I have
ifconfig_wlan0="-ht WPA SYNCDHCP"