Date: Tue, 19 Aug 2025 15:46:07 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: wireless@freebsd.org Subject: rtwn/rtl8821au: strange issue with 5GHz channels Message-ID: <4cb1c608-d534-4bfb-8cc9-92251000e0fd@FreeBSD.org>
index | next in thread | raw e-mail
I have an access point running OpenWRT.
Its 5 GHz radio is configured for 80 MHz width.
The channel is currently 149, I also tried 116 before.
This is according to OpenWRT guidelines that the channel should be set to the
lowest one in the range.
"radio1": {
"up": true,
"pending": false,
"autostart": true,
"disabled": false,
"retry_setup_failed": false,
"config": {
"path": "1e140000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0",
"band": "5g",
"htmode": "VHT80",
"cell_density": 0,
"country": "UA",
"channel": "149"
},
On the FreeBSD side I have very recent main / CURRENT, an Edimax EW-7811UAC USB
WiFi adapter with RTL8821AU recognized by rtwn driver.
I am trying to connect using WPA (wpa_supplicant).
That almost always fails and works only once out of dozen attempts.
With debug logs enabled it seems that there is a timeout receiving a management
frame from the AP (or something like that).
E.g.:
Aug 9 18:05:21 rock64b kernel: wlan0: ni 0xffff0000afe8f000 mode STA state AUTH
arg 0x2 status 0
Aug 9 18:05:23 rock64b kernel: wlan0: vap 0xffffa00005f47000 mode STA state
AUTH flags 0x42400 & 0x80
This may be unsurprising becomes the adapter sees a wrong / strange channel
number comparing to what's configured on the AP. It's almost always +4.
And only rarely it's the correct number. In those cases the connection works.
E.g., right now:
$ ifconfig wlan0 scan | sort -t '' -k 1.66,1.67n | head -2
SSID/MESH ID BSSID CHAN RATE S:N INT CAPS
HolyLan 7a:d2:94:80:1f:ec 153 54M -70:-95 100
EPS RSN BSSLOAD HTCAP VHTCAP VHTOPMODE VHTPWRENV WME
Looks like perhaps there is some wrong calculation in the driver when bandwidth
is greater than 20 MHz.
--
Andriy Gapon
home |
help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4cb1c608-d534-4bfb-8cc9-92251000e0fd>