Public bug reported:
Netgear A8000 (MediaTek mt7921u/mt7922 USB) intermittently loses
connectivity after many hours or overnight. The interface remains
associated with the AP and retains a DHCP address, but no traffic
passes.
Symptoms:
nmcli shows connected or attempts reconnection.
Ping to the default gateway returns "Destination Host Unreachable".
Kernel repeatedly logs:
unregister_netdevice: waiting for wlx... to become free. Usage count = 2
Previous debugging showed tee blocked inside mt792xu_disconnect() during
usb_unbind_interface().
Restarting
sudo systemctl restart wpa_supplicant NetworkManager
immediately restores connectivity without unplugging the adapter or
rebooting.
Additional observations
USB runtime power management disabled (power/control=on)
rfkill not blocked
interface still exists during failure
Wi-Fi PHY still present
NetworkManager restart does not recover the severe failure
USB unbind hangs
Driver unload therefore cannot complete
NOTE: I also have a 394 MB apport report. Would it be useful, or are the
attached failure-time logs sufficient?
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "wifi-debug-full-20260720-123100.zip"
https://bugs.launchpad.net/bugs/2161448/+attachment/5985046/+files/wifi-debug-full-20260720-123100.zip
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https://bugs.launchpad.net/bugs/2161448
Title:
mt7921u: USB Wi-Fi enters unrecoverable state after prolonged uptime;
NetworkManager/supplicant stalls followed by USB disconnect deadlock
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