Hello,
I'm encountering a reproducible stability issue with the*MediaTek
MT7921U USB WiFi adapter*under*OpenWRT*(tested with both 23.05.5 and
24.10.2 builds), using the upstream*mt76*driver.
https://forum.openwrt.org/t/beryl-ax-mt7921u-usb-phy-sta0-wedged-after-24hrs
Problem Summary:
After ~24 hours of continuous use in client mode (|phy2-sta0|,|wlan2|),
the adapter:
*
disconnects from the AP with a*deauthentication*
*
triggers a kernel log:
|unregister_netdevice: waiting for phy2-sta0 to become free. Usage
count = 1 |
*
does not recover without a full reboot
*
continues to be visible via|iw|or|ip|commands, but cannot rejoin
networks or reset
System Details:
*
*Hardware*: MT7921U USB WiFi adapter (based on MediaTek chipset)
*
*Driver*:|mt76-usb|from mainline (OpenWRT kernel 5.15 and 6.1 tested)
*
*Platform*: OpenWRT x86_64 and ARM routers
*
*Mode*: STA (client) mode only, acting as WAN uplink
*
*Interface*:|phy2-sta0|
Logs:
Example|iw dev phy2-sta0 link|and|station dump|show healthy connection
before failure, followed by:
*
sudden drop in traffic
*
deauth
*
log spam with netdevice not freeing
(Full dmesg trace and debug logs available on request)
Attempts to resolve:
*
Disabled power saving and powersave quirks
*
Reloading|mt76|modules: not sufficient to recover
*
Trying OpenWRT snapshots with newer kernel and latest firmware
* Problem is seen with 2.4GHz or 5GHz
* OIR of the module did not help
* The USB stick is not HW broken as I am not able to reproduce the
issue in my home-network with the same settings for days
Request:
Could you please help investigate or point to what additional logs or
patches I could test?
Let me know if I can assist with logs, traces, or testing patches.
Thanks,
Richard
