Since my Kubuntu 22.04 got the HWE kernel update from the 6.2 series(6.2.0-39) to the 6.5 series(6.5.0-14), I'm experiencing short ~30s WiFi hangs. Disconnecting and reconnecting from the network usually fixes them, and if I don't reconnect to the network, they resolve by themself after a while.
There is usually one hang ~5-10 minutes after booting up, and more randomly spaced hangs later on. The hangs are especially noticeable if I switch from an offline activity to the browser and try to open a website, only to find it not loading. For example, the "Similar questions" section randomly stopped loading while I was typing the question. I've not yet experienced the issue when playing real-time online games, leading me to think the issue might be driven by slow low-power mode exit in my wifi card. How do I investigate that?
Looking at dmesg, the odd things I can see is
[ 226.169003] warning: `kded5' uses wireless extensions which will stop working for Wi-Fi 7 hardware; use nl80211[ 745.934898] workqueue: pm_runtime_work hogged CPU for >10000us 8 times, consider switching to WQ_UNBOUND[ 1482.423020] workqueue: pm_runtime_work hogged CPU for >10000us 16 times, consider switching to WQ_UNBOUNDI'm digging through journalctl -b -u NetworkManager output but there is nothing obvious. Further debugging suggestions are welcome. Were there any significant changes in mt7921e power management between 6.2 and 6.5?
Not seeing anything obvious in https://www.phoronix.com/review/linux-65-features/2, https://www.phoronix.com/review/linux-64-features or https://www.phoronix.com/review/linux-63-features/2. The most suspicious change is BIG TCP enablement in 6.3, but I'm not sure how to check if it's enabled.
The symptoms correspond to https://community.frame.work/t/tracking-unstable-and-unreliable-wlan-rz616-mt7922-fw13-amd-diy/40316 and https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/2049220
System specifications:
lizsquir@PiMutant:~$ inxi -FzSystem: Kernel: 6.5.0-14-generic x86_64 bits: 64 Desktop: KDE Plasma 5.24.7 Distro: Ubuntu 22.04.3 LTS (Jammy Jellyfish)Machine: Type: Laptop System: ASUSTeK product: ROG Strix G513IH_G513IH v: 1.0 serial: <superuser required> Mobo: ASUSTeK model: G513IH v: 1.0 serial: <superuser required> UEFI: American Megatrends LLC. v: G513IH.301 date: 01/27/2021Battery: ID-1: BAT0 charge: 44.3 Wh (100.0%) condition: 44.3/56.0 Wh (79.0%)CPU: Info: 8-core model: AMD Ryzen 7 4800H with Radeon Graphics bits: 64 type: MT MCP cache: L2: 4 MiB Speed (MHz): avg: 1211 min/max: 400/4300 cores: 1: 1396 2: 1801 3: 1397 4: 400 5: 1439 6: 400 7: 400 8: 400 9: 1520 10: 3432 11: 1524 12: 400 13: 3680 14: 400 15: 400 16: 400Graphics: Device-1: NVIDIA TU117M [GeForce GTX 1650 Mobile / Max-Q] driver: nvidia v: 535.146.02 Device-2: AMD Renoir driver: amdgpu v: kernel Display: x11 server: X.Org v: 1.21.1.4 driver: X: loaded: amdgpu,ati,nvidia unloaded: fbdev,modesetting,nouveau,vesa gpu: amdgpu resolution: 1920x1080~144Hz OpenGL: renderer: RENOIR (renoir LLVM 15.0.7 DRM 3.54 6.5.0-14-generic) v: 4.6 Mesa 23.0.4-0ubuntu1~22.04.1Audio: Device-1: NVIDIA driver: snd_hda_intel Device-2: AMD Renoir Radeon High Definition Audio driver: snd_hda_intel Device-3: AMD Raven/Raven2/FireFlight/Renoir Audio Processor driver: N/A Device-4: AMD Family 17h HD Audio driver: snd_hda_intel Sound Server-1: ALSA v: k6.5.0-14-generic running: yes Sound Server-2: PulseAudio v: 15.99.1 running: yes Sound Server-3: PipeWire v: 0.3.48 running: yesNetwork: Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169 IF: enp2s0 state: down mac: <filter> Device-2: MEDIATEK MT7921 802.11ax PCI Express Wireless Network Adapter driver: mt7921e IF: wlp3s0 state: up mac: <filter>Bluetooth: Device-1: IMC Networks Wireless_Device type: USB driver: btusb Report: hciconfig ID: hci0 state: up address: <filter> bt-v: 3.0Drives: Local Storage: total: 476.94 GiB used: 154.59 GiB (32.4%) ID-1: /dev/nvme0n1 vendor: Samsung model: MZVLQ512HBLU-00B00 size: 476.94 GiBPartition: ID-1: / size: 234.88 GiB used: 86.01 GiB (36.6%) fs: btrfs dev: /dev/nvme0n1p2 ID-2: /boot/efi size: 511 MiB used: 23.1 MiB (4.5%) fs: vfat dev: /dev/nvme0n1p1 ID-3: /home size: 234.88 GiB used: 86.01 GiB (36.6%) fs: btrfs dev: /dev/nvme0n1p2Swap: ID-1: swap-1 type: partition size: 7.18 GiB used: 764.5 MiB (10.4%) dev: /dev/nvme0n1p3Sensors: System Temperatures: cpu: 52.0 C mobo: N/A gpu: amdgpu temp: 48.0 C Fan Speeds (RPM): cpu: 0Info: Processes: 415 Uptime: 3h 3m Memory: 7.17 GiB used: 4.28 GiB (59.6%) Shell: Bash inxi: 3.3.13