TP-Link TL-WN727N V3 - cannot scan or connect to anything

[Kevin Lo]

On 2013/12/31 02:36, Toomas Aas wrote:
> Hello!

Hi Toomas,

>
> I posted a request on the FreeBSD forums on this topic, but got no 
> responses:
> http://forums.freebsd.org/viewtopic.php?f=46&t=43895
>
> So, I'll repeat it here hoping that it may catch the attention of some 
> experts who are maybe not following the forums.
>
> I'm trying to get TP-Link TL-WN727N V3 USB wifi adapter working with 
> my FreeBSD 9.2-STABLE amd64 system (r259472). It seems to me that this 
> adapter uses Ralink RT5370 chipset, and support for this was merged to 
> 9-STABLE in r259457.
>
> I plug in the adapter and it seems to be recognized:
>
> Dec 18 18:13:15 kernel: ugen2.2: <TPlink> at usbus2
> Dec 18 18:13:15 kernel: run0: <1.0> on usbus2
> Dec 18 18:13:15 kernel: run0: MAC/BBP RT5390 (rev 0x0502), RF RT5370 
> (MIMO 1T1R), address f8:1a:67:19:40:24
>
> I create the wlan device:
>
> # ifconfig wlan0 create wlandev run0
>
> Then I try to scan, but both of the below commands return immediately 
> without any result:
>
> # ifconfig wlan0 up scan
> # ifconfig wlan0 list scan
>
> I tried running wlandebug -i wlan0 +scan, and an endless supply of 
> following is recorded in /var/log/messages:
>
> Dec 18 21:47:26 kernel: wlan0: ieee80211_check_scan: active scan, append
> Dec 18 21:47:26 kernel: wlan0: ieee80211_scanreq: flags 0x1b duration 
> 0x7fffffff mindwell 0 maxdwell 0 nssid 0
> Dec 18 21:47:26 kernel: wlan0: scan_update_locked: current scanner is 
> <none:none>, switch to <wlan0:STA>
> Dec 18 21:47:26 kernel: wlan0: start_scan_locked: active scan, 
> duration 2147483647 mindwell 0 maxdwell 0, desired mode auto, flush
> Dec 18 21:47:26 kernel: wlan0: scan set 1g, 6g, 11g, 7g, 2g, 3g, 4g, 
> 5g, 8g, 9g, 10g dwell min 20ms max 200ms
> Dec 18 21:47:26 kernel: wlan0: start_scan_locked: active scan already 
> in progress
> Dec 18 21:47:26 kernel: wlan0: scan_task: chan   1b ->   1g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:26 kernel: wlan0: scan_task: chan   1g ->   6g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:27 kernel: wlan0: scan_task: chan   6g ->  11g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:27 kernel: wlan0: scan_task: chan  11g ->   7g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:27 kernel: wlan0: scan_task: chan   7g ->   2g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:27 kernel: wlan0: scan_task: chan   2g ->   3g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:27 kernel: wlan0: scan_task: chan   3g ->   4g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:28 kernel: wlan0: scan_task: chan   4g ->   5g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:28 kernel: wlan0: scan_task: chan   5g ->   8g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:28 kernel: wlan0: scan_task: chan   8g ->   9g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:28 kernel: wlan0: scan_task: chan   9g ->  10g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:29 kernel: wlan0: sta_pick_bss: no scan candidate
> Dec 18 21:47:29 kernel: wlan0: scan_task: done, restart [ticks 
> 1706420, dwell min 20 scanend 2149187524]
> Dec 18 21:47:29 kernel: wlan0: scan_task: chan  10g ->   1g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:29 kernel: wlan0: scan_task: chan   1g ->   6g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:29 kernel: wlan0: scan_task: chan   6g ->  11g [active, 
> dwell min 20ms max 200ms]
> Dec 18 21:47:29 kernel: wlan0: scan_task: chan  11g ->   7g [active, 
> dwell min 20ms max 200ms]
>
> I've watched this output for 10 minutes and it just seems to go on 
> indefinitely. I'm not sure what to think of this. There are several 
> access points near me that the scan should find, but it doesn't. When 
> I plug in the same adapter to a laptop with Windows 7, it successfully 
> shows the nearby access points and allows me to connect to one, so the 
> adapter is not broken. Any ideas for further troubleshooting are welcome.

I hate debugging problems on the last day of the year :-)
It seems like the firmware forgot to MFC.  I just MFC'ed r256717.
Tested on the 9.2-STABLE (r260119) with the TL-WN727N wlan device.

Please give it a try, thanks.

     Kevin