Score:1

Ubuntu

Why 802.11n does not work with Wireless-AC 9560?

t0m

4/28/23, 6:51 PM

WIFI works only when I add: options iwlwifi 11n_disable=1 to /etc/modprobe.d/iwlwifi.conf see https://wiki.archlinux.org/title/Network_configuration/Wireless#iwlwifi

I need to use 802.11n, so I tried to comment line options iwlwifi 11n_disable=1, restart system, WIFI does not work and dmesg still prints:
(MAC address was the same and I replaced it by XX.)

[   57.556282] wlo1: authenticate with XX:XX:XX:XX:XX:XX
[   57.561958] wlo1: send auth to XX:XX:XX:XX:XX:XX (try 1/3)
[   57.613865] wlo1: authenticated
[   57.618280] wlo1: associate with XX:XX:XX:XX:XX:XX (try 1/3)
[   57.722239] wlo1: associate with XX:XX:XX:XX:XX:XX (try 2/3)
[   57.826210] wlo1: associate with XX:XX:XX:XX:XX:XX (try 3/3)
[   57.934293] wlo1: association with XX:XX:XX:XX:XX:XX timed out
[   65.558758] wlo1: authenticate with XX:XX:XX:XX:XX:XX
[   65.565087] wlo1: send auth to XX:XX:XX:XX:XX:XX (try 1/3)
[   65.627537] wlo1: authenticated
[   65.634256] wlo1: associate with XX:XX:XX:XX:XX:XX (try 1/3)
[   65.738333] wlo1: associate with XX:XX:XX:XX:XX:XX (try 2/3)
[   65.850198] wlo1: associate with XX:XX:XX:XX:XX:XX (try 3/3)
[   65.974282] wlo1: association with XX:XX:XX:XX:XX:XX timed out
[   78.401729] wlo1: authenticate with XX:XX:XX:XX:XX:XX
[   78.406747] wlo1: send auth to XX:XX:XX:XX:XX:XX (try 1/3)
[   78.477221] wlo1: authenticated
[   78.478235] wlo1: associate with XX:XX:XX:XX:XX:XX (try 1/3)
[   78.582448] wlo1: associate with XX:XX:XX:XX:XX:XX (try 2/3)
[   78.690357] wlo1: associate with XX:XX:XX:XX:XX:XX (try 3/3)
[   78.798380] wlo1: association with XX:XX:XX:XX:XX:XX timed out

and system cannot connect to the router. So 802.11n still cannot work properly?

System: Ubuntu 20.04 with all updates
WIFI card: Wireless-AC 9560
Router: TP-Link Archer C6 (HW: Archer C6 v2.0, Firmware: 1.3.6 Build 20200902)

Router settings:
Security: WPA/WPA2-Personal
Version: Auto | WPA-PSK | WPA2-PSK -- tried all
Encryption: TKIP | AES -- tried both
Mode: "802.11 b/g/n mixed" | "802.11 n only" -- tried both
Channels width: auto
Channel: auto
The router was always restarted after the change.

Computer settings:
Security: WPA/WPA2-Personal

Connection from Windows 10 from another notebook works perfectly in 802.11n.

Additional info: Sometimes dmesg shows: iwlwifi 0000:00:14.3: Unhandled alg: 0xc040071b System is disconnected from the network and system shows me a password dialog. Confirm password, network connection is established and works again.

0 + 0

networking

drivers

iwlwifi

20.04

ubfan1

4/28/23, 7:55 PM

Does your 80211n use the 5GHz band? AC only uses 5GHz, but n may be on the 2.4GHz.

t0m

4/28/23, 9:02 PM

5GHz is disabled on AC, so only 2.4GHz.

chili555

4/28/23, 9:08 PM

"MAC address replaced by XX" Are they, in every case, the exact same MAC address? Have you tried my troubleshooting steps here? https://askubuntu.com/questions/1364239/tp-link-usb-wireless-adapter-keep-losing-data-every-several-minutes-without-disc/1364295#1364295

heynnema

4/28/23, 11:38 PM

Is your computer using WPA2 or WPA3? What is the router set for... WPA2 or WPA3, or WPA2+WPA3? Start comments to me with @heynnema or I'll miss them.

t0m

4/29/23, 9:25 AM

@heynnema I answered to the post

heynnema

4/29/23, 2:00 PM

@t0m The proper setting for the router is WPA2-AES. What channels are the two networks set for? What are the wireless network's names? How long is the passphrase, and are there any special characters in it? Is the firmware in the router Archer C6(US)_V2_210226 (for a V2 router)? https://www.tp-link.com/us/support/download/archer-c6/

heynnema

4/29/23, 2:07 PM

@t0m If you need help discovering what version router see https://www.tp-link.com/us/support/faq/46/

t0m

4/30/23, 1:45 PM

@heynnema: I do not understand: "What channels are the two networks set for?" I used only 1 network. Channels info, HW + SW version of router added to the post.

heynnema

4/30/23, 1:57 PM

@t0m It looks like you've answered most, but not all, of my questions from my previous comment. Please review. First things first, you need to update the firmware on the router.

heynnema

4/30/23, 2:06 PM

@t0m Just curious... any particular reason that you're not using the 5Ghz band?

gatopeich

5/17/23, 2:34 PM

Same here with Wireless-AC 9260 and Archer C6 router: 5 Ghz works with frequent disconnects, and 2.4 Ghz only works with `11n_disable=1`, thanks for the tip!

chili555

5/17/23, 2:44 PM

Please see my troubleshooting steps here: https://askubuntu.com/questions/1364239/tp-link-usb-wireless-adapter-keep-losing-data-every-several-minutes-without-disc/1364295#1364295