iwlwifi keeps disconnecting with Reason: 3=DEAUTH_LEAVING

[yuri69]

Using Intel iwlwifi in DVM mode with kernel 5.13 on an old Lenovo T430.

The WiFi connection goes down and back up from time to time. The stable period is sometimes hours, sometimes just a minute or so. It is quite annoying and I've already spent some time solving that.

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The rest of network-related tooling s NM & WPA_supplicant as the backend and systemd-resolved. The WPA_supplicant is set to be started on-demand via D-Bus.

There should be no other network management tool running. The NM is set to autoconect to a single 5GHz SSID. So no roaming or BT interference issues should apply.

WiFi power management is OFF even in BIOS.

The AP in question is a TP-Link Archer C5 V4 with the latest FW and 5GHz channel width set to fixed 40MHz. When testing the signal strength is over 85%.

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Observations:

* The iwconfig's Invalid misc gets pretty high.
* Given syslog ordering the first disconnect action is emitted by the kernel:

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...
Sep 05 14:37:25 gentoo kernel: wlan0: deauthenticated from 0c:80:63:cc:42:88 (Reason: 3=DEAUTH_LEAVING)
Sep 05 14:37:25 gentoo wpa_supplicant[1868]: wlan0: CTRL-EVENT-DISCONNECTED bssid=0c:80:63:cc:42:88 reason=3
Sep 05 14:37:25 gentoo wpa_supplicant[1868]: dbus: wpa_dbus_property_changed: no property SessionLength in object /fi/w1/wpa_supplicant1/Interfaces/6
Sep 05 14:37:25 gentoo wpa_supplicant[1868]: wlan0: CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD
Sep 05 14:37:25 gentoo NetworkManager[347]: <info>  [1630845445.4903] device (wlan0): supplicant interface state: completed -> disconnected
Sep 05 14:37:25 gentoo NetworkManager[347]: <info>  [1630845445.5806] device (wlan0): supplicant interface state: disconnected -> scanning
Sep 05 14:37:28 gentoo wpa_supplicant[1868]: wlan0: SME: Trying to authenticate with 0c:80:63:cc:42:88
 (SSID='FOO123' freq=5240 MHz)
Sep 05 14:37:28 gentoo kernel: wlan0: authenticate with 0c:80:63:cc:42:88
Sep 05 14:37:28 gentoo kernel: wlan0: send auth to 0c:80:63:cc:42:88 (try 1/3)
Sep 05 14:37:28 gentoo NetworkManager[347]: <info>  [1630845448.7240] device (wlan0): supplicant interface state: scanning -> authenticating
Sep 05 14:37:28 gentoo kernel: wlan0: authenticated
...

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Any ideas how to debug this further?

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iwconfig wlan0:

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wlan0     IEEE 802.11  ESSID:"FOO123"  
          Mode:Managed  Frequency:5.24 GHz  Access Point: 0C:80:63:CC:42:88   
          Bit Rate=120 Mb/s   Tx-Power=15 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=59/70  Signal level=-51 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:1  Invalid misc:8149   Missed beacon:0

dmesg bootup:

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[    3.497244] iwlwifi 0000:03:00.0: can't disable ASPM; OS doesn't have ASPM control
[    3.500960] iwlwifi 0000:03:00.0: loaded firmware version 18.168.6.1 6000g2a-6.ucode op_mode iwldvm
...
[    3.613847] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_DEBUG disabled
[    3.615088] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_DEBUGFS disabled
[    3.616093] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled
[    3.617199] iwlwifi 0000:03:00.0: Detected Intel(R) Centrino(R) Advanced-N 6205 AGN, REV=0xB0

modinfo iwlwifi

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filename:       /lib/modules/5.13.12-gentoo/kernel/drivers/net/wireless/intel/iwlwifi/iwlwifi.ko
license:        GPL
author:         Intel Corporation <linuxwifi@intel.com>
description:    Intel(R) Wireless WiFi driver for Linux
firmware:       iwlwifi-100-5.ucode
firmware:       iwlwifi-1000-5.ucode
firmware:       iwlwifi-135-6.ucode
firmware:       iwlwifi-105-6.ucode
firmware:       iwlwifi-2030-6.ucode
firmware:       iwlwifi-2000-6.ucode
firmware:       iwlwifi-5150-2.ucode
firmware:       iwlwifi-5000-5.ucode
firmware:       iwlwifi-6000g2b-6.ucode
firmware:       iwlwifi-6000g2a-6.ucode
firmware:       iwlwifi-6050-5.ucode
firmware:       iwlwifi-6000-6.ucode
alias: ....
depends:        cfg80211
intree:         Y
name:           iwlwifi
vermagic:       5.13.12-gentoo SMP preempt mod_unload 
parm:           swcrypto:using crypto in software (default 0 [hardware]) (int)
parm:           11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm:           amsdu_size:amsdu size 0: 12K for multi Rx queue devices, 2K for AX210 devices, 4K for other devices 1:4K 2:8K 3:12K (16K buffers) 4: 2K (default 0) (int)
parm:           fw_restart:restart firmware in case of error (default true) (bool)
parm:           nvm_file:NVM file name (charp)
parm:           uapsd_disable:disable U-APSD functionality bitmap 1: BSS 2: P2P Client (default: 3) (uint)
parm:           enable_ini:Enable debug INI TLV FW debug infrastructure (default: true (bool)
parm:           bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm:           led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0) (int)
parm:           power_save:enable WiFi power management (default: disable) (bool)
parm:           power_level:default power save level (range from 1 - 5, default: 1) (int)
parm:           disable_11ac:Disable VHT capabilities (default: false) (bool)
parm:           remove_when_gone:Remove dev from PCIe bus if it is deemed inaccessible (default: false) (bool)
parm:           disable_11ax:Disable HE capabilities (default: false) (bool)

[NeddySeagoon]

yuri69,

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Reason: 3=DEAUTH_LEAVING

means that the interface was commanded to disconnect.

It looks like you have already looked into too many network interface managers fighting over the interface.
How did you test?

My preference is to remove them all from any run levels, then reboot.
WiFi should not start. If it does, you missed one.

Once you can reboot with wifi not starting, start it by hand. Now you know exactly what's controlling the interface.
Add your preferred network interface manager back to the default runlevel.

[yuri69]

Disabled the NM service. Rebooted. WiFi was not connected. Started NM manually. WiFi went online.

So my guess is the network management is correct.

[NeddySeagoon]

yuri69,

That sounds good.

What does

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rc-update show --verbose

tell?
If you use systemd, that won't work.

[yuri69]

Yes, I do use systemd. The equivalent should be

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systemctl list-unit-files --state=enabled

Output:

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UNIT FILE                          STATE   VENDOR PRESET
acpid.service                      enabled disabled     
chronyd.service                    enabled disabled     
getty@.service                     enabled enabled      
NetworkManager-dispatcher.service  enabled disabled     
NetworkManager-wait-online.service enabled disabled     
NetworkManager.service             enabled disabled     
preload.service                    enabled disabled     
rngd.service                       enabled disabled     
systemd-resolved.service           enabled enabled      
thermald.service                   enabled disabled     
acpid.socket                       enabled disabled     
machines.target                    enabled enabled      
remote-fs.target                   enabled enabled      
fstrim.timer                       enabled disabled     
xfs_scrub_all.timer                enabled disabled   

// edit: fixed command

[yuri69]

4 days ago I switched to 2.4GHz only in NM. So far got no disconnection since then. It seems like a problem with the 5GHz WiFi...