[Bug 2161448] Re: mt7921u: USB Wi-Fi enters unrecoverable state after prolonged uptime; NetworkManager/supplicant stalls followed by USB disconnect deadlock

Hello Krystian, in August you mentioned you could try to bring Sean Wang's mt76 USB fix into the Ubuntu kernel. The full series has since landed in v7.3-rc1 ("harden USB reset and disconnect paths": d23353688dd0, 161596f033e8, e137e5fd245c, 7910bd565d8b, a4803d1801c7, b994cb409f21, with the dependency 5323d3e50c20). I see the same MT7921AU USB hang on resolute (7.0.0-38): the whole chip (WiFi and Bluetooth) stops answering, with "vendor request ... failed:-110" every ~3 s, and only a reboot recovers it. Logs are in LP#2167595, comment #16. Would you consider an SRU of this series for resolute (and noble HWE)? I can test a PPA or -proposed kernel on affected hardware. Thank you, Piotr -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb 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 Status in linux package in Ubuntu: Confirmed Bug description: 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? --- ProblemType: Bug ApportVersion: 2.28.2-0ubuntu0.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: ysuhail 2853 F.... wireplumber /dev/snd/controlC0: ysuhail 2853 F.... wireplumber /dev/snd/seq: ysuhail 2851 F.... pipewire CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME DistroRelease: Ubuntu 24.04 InstallationDate: Installed on 2026-06-25 (28 days ago) InstallationMedia: Ubuntu-Server 24.04.4 LTS "Noble Numbat" - Release amd64 (20260210) MachineType: ASUS System Product Name Package: linux (not installed) ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> ProcFB: 0 nvidia-drmdrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-28-generic root=UUID=8bb051d9-0961-4018-b123-40eba5aa4bdb ro nomodeset pcie_aspm=off loglevel=3 ProcVersionSignature: Ubuntu 7.0.0-28.28~24.04.1-generic 7.0.12 RelatedPackageVersions: linux-restricted-modules-7.0.0-28-generic N/A linux-backports-modules-7.0.0-28-generic N/A linux-firmware 20240318.git3b128b60-0ubuntu2.27 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no Tags: noble Uname: Linux 7.0.0-28-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sudo users _MarkForUpload: True dmi.bios.date: 07/18/2025 dmi.bios.release: 12.3 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1203 dmi.board.asset.tag: Default string dmi.board.name: Pro WS WRX90E-SAGE SE dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1203:bd07/18/2025:br12.3:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnProWSWRX90E-SAGESE:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU:pfaTobefilledbyO.E.M.: dmi.product.family: To be filled by O.E.M. dmi.product.name: System Product Name dmi.product.sku: SKU dmi.product.version: System Version dmi.sys.vendor: ASUS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161448/+subscriptions