Again issues with AX500 wifi on Dell XPS 13 9310

Everything worked fine with the XPS 13 9310 and Killer AX500 wifi (wlp113s0) before the update to latest linux firmware (20220119.0c6a7b3-3), see details below. Not sure if this is the reason or a co-incidence.

The issue is that the connection to the internet frequently drops while the connection to the router remains active. To re-establish the internet connection, I have to disconnect and reconnect. Then it will work for a short time before it stops again.

I had trouble with the AX500 wifi already months ago but after changing my network from 2.4/5Ghz to 2.4Ghz, it worked (but it stopped working now). There are many threads in which similar problems and solutions were described, however, the error message “ath11k_pci 0000:71:00.0: Received with invalid mcs in VHT mode 10” seems to be unique to my setup.

inxi -Fxxxz --no-host

System:
  Kernel: 5.15.19-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0
    Desktop: GNOME 41.3 tk: GTK 3.24.31 wm: gnome-shell
    dm: GDM 41.3, LightDM 1.30.0 Distro: Manjaro Linux base: Arch Linux
Machine:
  Type: Laptop System: Dell product: XPS 13 9310 v: N/A
    serial: <superuser required> Chassis: type: 10 serial: <superuser required>
  Mobo: Dell model: 0MRT12 v: A00 serial: <superuser required> UEFI: Dell
    v: 3.2.0 date: 09/30/2021
Battery:
  ID-1: BAT0 charge: 49.1 Wh (100.0%) condition: 49.1/51.0 Wh (96.4%)
    volts: 8.7 min: 7.6 model: BYD DELL FP86V0A type: Li-poly serial: <filter>
    status: Full
CPU:
  Info: quad core model: 11th Gen Intel Core i7-1185G7 bits: 64 type: MT MCP
    smt: enabled arch: Tiger Lake rev: 1 cache: L1: 320 KiB L2: 5 MiB
    L3: 12 MiB
  Speed (MHz): avg: 1354 high: 1683 min/max: 400/4800 cores: 1: 1473
    2: 1458 3: 1683 4: 1061 5: 1048 6: 1277 7: 1242 8: 1594 bogomips: 47936
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
  Device-1: Intel TigerLake-LP GT2 [Iris Xe Graphics] vendor: Dell
    driver: i915 v: kernel bus-ID: 0000:00:02.0 chip-ID: 8086:9a49
    class-ID: 0300
  Device-2: Microdia Integrated_Webcam_HD type: USB driver: uvcvideo
    bus-ID: 3-6:3 chip-ID: 0c45:672a class-ID: 0e02
  Display: wayland server: X.Org 1.21.1.4 compositor: gnome-shell driver:
    loaded: modesetting alternate: fbdev,vesa resolution: 1920x1200~60Hz
    s-dpi: 96
  Message: Unable to show advanced data. Required tool glxinfo missing.
Audio:
  Device-1: Intel Tiger Lake-LP Smart Sound Audio vendor: Dell
    driver: sof-audio-pci-intel-tgl bus-ID: 0000:00:1f.3 chip-ID: 8086:a0c8
    class-ID: 0401
  Sound Server-1: ALSA v: k5.15.19-1-MANJARO running: yes
  Sound Server-2: JACK v: 1.9.20 running: no
  Sound Server-3: PulseAudio v: 15.0 running: yes
  Sound Server-4: PipeWire v: 0.3.45 running: yes
Network:
  Message: No device data found.
  IF-ID-1: wlp113s0 state: up mac: <filter>
RAID:
  Hardware-1: Intel Volume Management Device NVMe RAID Controller driver: vmd
    v: 0.6 port: N/A bus-ID: 0000:00:0e.0 chip-ID: 8086:9a0b rev:
    class-ID: 0104
Drives:
  Local Storage: total: 953.87 GiB used: 65.56 GiB (6.9%)
  ID-1: /dev/nvme0n1 vendor: KIOXIA model: KXG60ZNV1T02 NVMe 1024GB
    size: 953.87 GiB speed: 31.6 Gb/s lanes: 4 type: SSD serial: <filter>
    rev: 10604107 temp: 45.9 C scheme: GPT
Partition:
  ID-1: / size: 30.59 GiB used: 16.88 GiB (55.2%) fs: ext4
    dev: /dev/nvme0n1p3
  ID-2: /boot/efi size: 15.61 GiB used: 304 KiB (0.0%) fs: vfat
    dev: /dev/nvme0n1p1
  ID-3: /home size: 830.16 GiB used: 48.68 GiB (5.9%) fs: ext4
    dev: /dev/nvme0n1p4
Swap:
  ID-1: swap-1 type: partition size: 62.5 GiB used: 0 KiB (0.0%) priority: -2
    dev: /dev/nvme0n1p2
Sensors:
  System Temperatures: cpu: 44.0 C mobo: N/A
  Fan Speeds (RPM): cpu: 0 fan-2: 0
Info:
  Processes: 269 Uptime: 14m wakeups: 1456 Memory: 31.06 GiB
  used: 3.42 GiB (11.0%) Init: systemd v: 250 Compilers: gcc: 11.1.0
  clang: 13.0.0 Packages: 1429 pacman: 1420 flatpak: 5 snap: 4 Shell: Bash
  v: 5.1.16 running-in: gnome-terminal inxi: 3.3.12

sudo pacman -Qi linux-firmware

Name            : linux-firmware
Version         : 20220119.0c6a7b3-3
Description     : Firmware files for Linux
Architecture    : any
URL             : https://git.kernel.org/?p=linux/kernel/git/firmware/linux-firmware.git;a=summary
Licenses        : GPL2  GPL3  custom
Groups          : None
Provides        : None
Depends On      : linux-firmware-whence
Optional Deps   : None
Required By     : linux510-qca6390  linux515
Optional For    : None
Conflicts With  : None
Replaces        : None
Installed Size  : 431.07 MiB
Packager        : Philip Mueller <philm@manjaro.org>
Build Date      : Fri 04 Feb 2022 02:48:13 AM PST
Install Date    : Thu 10 Feb 2022 05:15:24 PM PST
Install Reason  : Installed as a dependency for another package
Install Script  : No
Validated By    : Signature

sudo modprobe ath11k_pci

no output

sudo dmesg | grep -i ath11k | tail -n12

[  823.013687] ath11k_pci 0000:71:00.0: Received with invalid mcs in VHT mode 10
[  825.733101] ath11k_warn: 15 callbacks suppressed
[  825.733138] ath11k_pci 0000:71:00.0: Received with invalid mcs in VHT mode 10
[  825.733155] ath11k_pci 0000:71:00.0: Received with invalid mcs in VHT mode 10
[  825.767566] ath11k_pci 0000:71:00.0: Received with invalid mcs in VHT mode 10
[  825.785887] ath11k_pci 0000:71:00.0: Received with invalid mcs in VHT mode 10
[  825.853570] ath11k_pci 0000:71:00.0: Received with invalid mcs in VHT mode 10
[  825.985142] ath11k_pci 0000:71:00.0: Received with invalid mcs in VHT mode 10
[  826.007385] ath11k_pci 0000:71:00.0: Received with invalid mcs in VHT mode 10
[  826.035711] ath11k_pci 0000:71:00.0: Received with invalid mcs in VHT mode 10
[  826.039825] ath11k_pci 0000:71:00.0: Received with invalid mcs in VHT mode 10
[  826.044578] ath11k_pci 0000:71:00.0: Received with invalid mcs in VHT mode 10