ModemManager: ModemManager keeps reloading wifi interface

[mlo40]

Package Name

ModemManager

Maintainer

(@feckert)

OpenWrt Version

25.12.1

OpenWrt Target/Subtarget

mediatek/filogic

Steps to Reproduce

1.Installed modemmanager luci-proto-modemmanager kmod-usb-net-qmi-wwan kmod-usb-serial-option kmod-mhi-bus kmod-mhi-net kmod-mhi-pci-generic kmod-mhi-wwan-ctrl kmod-mhi-wwan-mbim kmod-qrtr-mhi
2.Configured multiple WiFi AP (2.4GHz, 5GHz, 6GHz)
3.Configured modemmanager wan interface
4.Started observing periodic wifi drops/disconnects

Actual Behaviour

Modemmanager causing constant hotplug remove/add events for all phy-ap's

Device: Banana Pi BPI-R4 (MediaTek MT7988)
WiFi Card: MediaTek MT7996E (PCIe: 0000:01:00.0)
ModemManager Version: 1.24.0
Modem RM520NGLAAR03A01M4G

I currently have this workaround

/lib/udev/rules.d/78-mm-wifi-blacklist.rules

ACTION!="add|change|move|bind", GOTO="mm_wifi_blacklist_end"
SUBSYSTEM=="net", DEVPATH=="/devices/pci0000:00/0000:00:00.0/0000:01:00.0/*", ENV{ID_MM_DEVICE_IGNORE}="1"
LABEL="mm_wifi_blacklist_end"

/etc/init.d/modemmanager restart

kernal.log
system.log

snippet of log exhibiting behavior

[25 Mar 2026, 20:39:16 UTC] daemon.info: ModemManager[9742]: hotplug: add network interface phy0.1-ap0: event processed
[25 Mar 2026, 20:39:16 UTC] kern.info: [ 3574.497241] mt7996e 0000:01:00.0 phy0.1-ap0: entered promiscuous mode
[25 Mar 2026, 20:39:16 UTC] daemon.warn: [2724]: [base-manager] additional port phy0.1-ap0 in device '/sys/devices/platform/soc/11300000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0' added after device probing has already finished
[25 Mar 2026, 20:39:16 UTC] daemon.info: [2724]: [base-manager] last device '/sys/devices/platform/soc/11300000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0' probing had failed, will retry
[25 Mar 2026, 20:39:16 UTC] kern.info: [ 3574.509690] br-lan: port 8(phy0.1-ap0) entered blocking state
[25 Mar 2026, 20:39:16 UTC] kern.info: [ 3574.515453] br-lan: port 8(phy0.1-ap0) entered forwarding state
[25 Mar 2026, 20:39:16 UTC] daemon.notice: hostapd: phy0.1-ap0: interface state UNINITIALIZED->COUNTRY_UPDATE
[25 Mar 2026, 20:39:16 UTC] kern.info: [ 3574.521755] br-lan: port 8(phy0.1-ap0) entered disabled state
[25 Mar 2026, 20:39:16 UTC] daemon.notice: hostapd: phy0.1-ap0: interface state COUNTRY_UPDATE->HT_SCAN
[25 Mar 2026, 20:39:17 UTC] kern.info: [ 3575.032136] br-lan: port 8(phy0.1-ap0) entered blocking state
[25 Mar 2026, 20:39:17 UTC] kern.info: [ 3575.037893] br-lan: port 8(phy0.1-ap0) entered forwarding state
[25 Mar 2026, 20:39:17 UTC] daemon.notice: netifd: Network device 'phy0.1-ap0' link is up
[25 Mar 2026, 20:39:17 UTC] daemon.notice: hostapd: phy0.1-ap0: interface state HT_SCAN->ENABLED
[25 Mar 2026, 20:39:17 UTC] daemon.notice: hostapd: phy0.1-ap0: AP-ENABLED
[25 Mar 2026, 20:39:18 UTC] daemon.warn: odhcpd[2497]: No default route present, setting ra_lifetime to 0!
[25 Mar 2026, 20:39:18 UTC] daemon.info: dnsmasq[1]: read /etc/hosts - 12 names
[25 Mar 2026, 20:39:18 UTC] daemon.info: dnsmasq[1]: read /tmp/hosts/dhcp.cfg01411c - 5 names
[25 Mar 2026, 20:39:18 UTC] daemon.info: dnsmasq[1]: read /tmp/hosts/odhcpd.hosts.lan - 4 names
[25 Mar 2026, 20:39:18 UTC] daemon.info: dnsmasq-dhcp[1]: read /etc/ethers - 0 addresses
[25 Mar 2026, 20:39:20 UTC] daemon.notice: [2724]: [base-manager] couldn't check support for device '/sys/devices/platform/soc/11300000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0': not supported by any plugin
[25 Mar 2026, 20:40:55 UTC] daemon.notice: hostapd: Set MLD config: [ ]
[25 Mar 2026, 20:40:55 UTC] daemon.notice: hostapd: Reload all interfaces
[25 Mar 2026, 20:40:55 UTC] daemon.notice: wpa_supplicant[2362]: Set MLD config: [ ]
[25 Mar 2026, 20:40:55 UTC] daemon.notice: hostapd: Reloaded settings for phy phy0.0
[25 Mar 2026, 20:40:55 UTC] daemon.notice: hostapd: Reloaded settings for phy phy0.1
[25 Mar 2026, 20:40:55 UTC] daemon.notice: hostapd: Reloaded settings for phy phy0.2
[25 Mar 2026, 20:40:56 UTC] daemon.notice: netifd: radio1 (10086): wifi-scripts: Starting
[25 Mar 2026, 20:40:56 UTC] daemon.notice: netifd: radio1 (10086): command failed: Not supported (-95)
[25 Mar 2026, 20:40:56 UTC] daemon.notice: hostapd: Set MLD config: [ ]
[25 Mar 2026, 20:40:56 UTC] daemon.notice: hostapd: Reload all interfaces
[25 Mar 2026, 20:40:56 UTC] daemon.notice: hostapd: Reloaded settings for phy phy0.0
[25 Mar 2026, 20:40:56 UTC] daemon.notice: wpa_supplicant[2362]: Set MLD config: [ ]
[25 Mar 2026, 20:40:56 UTC] daemon.notice: hostapd: Reloaded settings for phy phy0.1
[25 Mar 2026, 20:40:56 UTC] daemon.notice: hostapd: Reloaded settings for phy phy0.2
[25 Mar 2026, 20:40:56 UTC] daemon.notice: wpa_supplicant[2362]: Set new config for phy phy0.1
[25 Mar 2026, 20:40:56 UTC] daemon.notice: hostapd: Set new config for phy phy0.1: /var/run/hostapd-phy0.1.conf
[25 Mar 2026, 20:40:56 UTC] daemon.notice: hostapd: Restart interface for phy phy0.1
[25 Mar 2026, 20:40:56 UTC] daemon.notice: hostapd: Remove interface 'phy0.1'
[25 Mar 2026, 20:40:56 UTC] daemon.notice: hostapd: phy0.1-ap0: interface state ENABLED->DISABLED
[25 Mar 2026, 20:40:56 UTC] daemon.notice: hostapd: phy0.1-ap0: AP-DISABLED
[25 Mar 2026, 20:40:56 UTC] daemon.notice: hostapd: phy0.1-ap0: CTRL-EVENT-TERMINATING
[25 Mar 2026, 20:40:56 UTC] daemon.err: hostapd: rmdir[ctrl_interface=/var/run/hostapd]: Permission denied
[25 Mar 2026, 20:40:56 UTC] kern.info: [ 3673.612078] mt7996e 0000:01:00.0 phy0.1-ap0: left allmulticast mode
[25 Mar 2026, 20:40:56 UTC] kern.info: [ 3673.618363] mt7996e 0000:01:00.0 phy0.1-ap0: left promiscuous mode
[25 Mar 2026, 20:40:56 UTC] kern.info: [ 3673.624609] br-lan: port 8(phy0.1-ap0) entered disabled state
[25 Mar 2026, 20:40:56 UTC] daemon.notice: netifd: Network device 'phy0.1-ap0' link is down
[25 Mar 2026, 20:40:56 UTC] daemon.info: ModemManager[10117]: hotplug: remove network

Confirmation Checklist

• The package is maintained in this repository.
• I understand that issues related to the base OpenWrt repository or LuCI repository will be closed.
• I am reporting an issue for OpenWrt, not an unsupported fork.

[brada4]

You can drive that modem without modem manager, like using luci-proto-qmi. ModemManager is a (typically) desktop component that works with less than standard modems.

[mlo40]

Personally every time i have tried using qmi and mbim, they have never worked properly, i am very much a regular end user.

[brada4]

Check documentation https://openwrt.org/docs/guide-user/network/wan/wwan/ltedongle

[mlo40]

With all due respect, this is just a bug report to document the existence of a issue, as i have stated the workaround i have currently works, so i am not looking for a alternative to modemmanager.

I am sorry to have taken up your time, but this conversation is unrelated to the issue.

I will also mention for the record i have already gone through all relevant official and unofficial documentation on lte modems for openwrt in 2024, 2025 as part of my attempts at setting up a diy 5G modem.

[brada4]

• yes there is an issue in modemmanager
• if you want connectivity fet rid of it and ... connect