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Yet Another Slow Shutdown Involving NetworkManager...

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    Yet Another Slow Shutdown Involving NetworkManager...

    ...this time with the 6.14.0-27-generic kernel. Running X11 on a system that is dual-bootable to both Kubuntu and Win11. (I rarely run Win11.) I was viewing the SanDisk and Yahoo Mail websites using Chromium in incognito mode (because I hate leaving cookie crumbs for others to follow). NetworkManager started acting up, consuming 100% of a single CPU, during which time the NetworkManager icon on my taskbar went orange-red. (I run both LAN and WiFi on this desktop.) The ifconfig command hung. I performed "top" to see NetworkManager at 100% and to obtain the NetworkManager PID. I then attempted to kill NetworkManager using "sudo kill <NetworkManager PID>, but the "sudo" command hung. (All "sudo" commands hung during this time which is likely not a clue but only a symptom.) However...and this is the only time I've _really_ needed to do this...I previously set a password for root and I was able to become root via "su". As root, I then killed the NetworkManager PID. All was allegedly back to normal. I then performed "shutdown -r", but found that processes associated with fwupd-refresh.service, postfix@.service and cups-browsed.service refused to die until MUCH later when the operating system finally sent SIGKILL. And just as before, while the system did shutdown, it did not power off the hardware, leaving up a display stating that /dev/sda needed to perform some cache saving or something similar...and /dev/sda was NOT mounted and is essentially NEVER used, since I run a SSD. As such, the reboot required by "shutdown -r" did not occur.

    Also, my Plasma display sometimes crashes but recovers. Yes, it is annoying.

    1. Let me know if I need to post this elsewhere in kubuntu forums.

    2. Could this nonsense be caused by UEFI/BIOS settings?

    3. Tell me exactly what information you need from me. Here is what is returned by "inxi -xxz -F":
    System:

    Kernel: 6.14.0-27-generic arch: x86_64 bits: 64 compiler: gcc v: 13.3.0
    Desktop: KDE Plasma v: 5.27.12 tk: Qt v: 5.15.13 wm: kwin_x11 dm: SDDM
    Distro: Kubuntu 24.04.2 LTS (Noble Numbat) base: Ubuntu

    Machine:

    Type: Desktop Mobo: Micro-Star model: PRO B650-VC WIFI III (MS-7E18) v: 1.0
    serial: &lt;superuser required&gt; part-nu: Desktop UEFI: American Megatrends LLC.
    v: 1.H4 date: 12/20/2024

    CPU:

    Info: 12-core model: AMD Ryzen 9 9900X bits: 64 type: MT MCP MCM arch: N/A
    rev: 0 cache: L1: 960 KiB L2: 12 MiB L3: 64 MiB
    Speed (MHz): avg: 3104 high: 3634 min/max: 600/5662 boost: enabled cores:
    1: 3001 2: 3001 3: 3634 4: 3001 5: 3001 6: 3001 7: 3001 8: 3001 9: 3001
    10: 3001 11: 3001 12: 3001 13: 3001 14: 3001 15: 3608 16: 3001 17: 3001
    18: 3001 19: 3624 20: 3623 21: 3001 22: 3001 23: 3001 24: 3001
    bogomips: 211199
    Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm

    Graphics:

    Device-1: NVIDIA vendor: Micro-Star MSI driver: nvidia v: 575.64.03 pcie:
    speed: 32 GT/s lanes: 16 ports: active: none off: DP-1,DP-2
    empty: DP-3,HDMI-A-2 bus-ID: 01:00.0 chip-ID: 10de:2f04
    Device-2: AMD vendor: Micro-Star MSI driver: amdgpu v: kernel pcie:
    speed: 16 GT/s lanes: 16 ports: active: none empty: HDMI-A-1,Writeback-1
    bus-ID: 13:00.0 chip-ID: 1002:13c0 temp: 34.0 C
    Display: x11 server: X.Org v: 21.1.11 with: Xwayland v: 23.2.6
    compositor: kwin_x11 driver: X: loaded: amdgpu,nvidia
    unloaded: fbdev,modesetting,nouveau,vesa dri: radeonsi
    gpu: nvidia,nvidia-nvswitch display-ID: :0 screens: 1
    Screen-1: 0 s-res: 3360x1050 s-dpi: 87
    Monitor-1: DP-1 note: disabled pos: right model: LG (GoldStar) W2252
    res: 1680x1050 dpi: 90 diag: 585mm (23")
    Monitor-2: DP-2 mapped: DP-3 note: disabled pos: primary,left
    model: LG (GoldStar) L226W res: 1680x1050 dpi: 90 diag: 585mm (23")
    API: EGL v: 1.5 platforms: device: 0 drv: nvidia device: 1 drv: radeonsi
    device: 3 drv: swrast gbm: drv: kms_swrast surfaceless: drv: nvidia x11:
    drv: nvidia inactive: wayland,device-2
    API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: nvidia mesa v: 575.64.03
    glx-v: 1.4 direct-render: yes renderer: NVIDIA GeForce RTX 5070/PCIe/SSE2
    API: Vulkan v: 1.3.275 surfaces: xcb,xlib device: 0 type: discrete-gpu
    driver: N/A device-ID: 10de:2f04 device: 1 type: integrated-gpu driver: N/A
    device-ID: 1002:13c0 device: 2 type: cpu driver: N/A device-ID: 10005:0000

    Audio:

    Device-1: NVIDIA driver: snd_hda_intel v: kernel pcie: speed: 32 GT/s
    lanes: 16 bus-ID: 01:00.1 chip-ID: 10de:2f80
    Device-2: AMD Rembrandt Radeon High Definition Audio
    vendor: Micro-Star MSI driver: snd_hda_intel v: kernel pcie: speed: 16 GT/s
    lanes: 16 bus-ID: 13:00.1 chip-ID: 1002:1640
    Device-3: AMD Family 17h/19h HD Audio vendor: Micro-Star MSI
    driver: snd_hda_intel v: kernel pcie: speed: 16 GT/s lanes: 16
    bus-ID: 13:00.6 chip-ID: 1022:15e3
    API: ALSA v: k6.14.0-27-generic status: kernel-api
    Server-1: PipeWire v: 1.0.5 status: active with: 1: pipewire-pulse
    status: active 2: wireplumber status: active
    Server-2: PulseAudio v: 16.1 status: off (using pipewire-pulse)

    Network:

    Device-1: Realtek RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet
    vendor: Micro-Star MSI RTL8111/8168/8411 driver: r8169 v: kernel pcie:
    speed: 2.5 GT/s lanes: 1 port: e000 bus-ID: 0f:00.0 chip-ID: 10ec:8168
    IF: enp15s0 state: up speed: 1000 Mbps duplex: full mac: &lt;filter&gt;
    Device-2: Qualcomm WCN785x Wi-Fi 7 320MHz 2x2 [FastConnect 7800]
    vendor: Foxconn Band Simultaneous Wireless driver: ath12k_pci v: N/A pcie:
    speed: 8 GT/s lanes: 1 bus-ID: 10:00.0 chip-ID: 17cb:1107
    IF: wlp16s0 state: up mac: &lt;filter&gt;
    IF-ID-1: virbr0 state: down mac: &lt;filter&gt;

    Bluetooth:

    Device-1: Foxconn / Hon Hai driver: btusb v: 0.8 type: USB rev: 1.1
    speed: 12 Mb/s lanes: 1 bus-ID: 1-12:3 chip-ID: 0489:e10a
    Report: hciconfig ID: hci0 rfk-id: 0 state: up address: &lt;filter&gt; bt-v: 5.3
    lmp-v: 12 sub-v: 7fe5

    Drives:

    Local Storage: total: 3.64 TiB used: 504.15 GiB (13.5%)
    ID-1: /dev/nvme0n1 vendor: Western Digital model: WD Green SN3000 2TB
    size: 1.82 TiB speed: 63.2 Gb/s lanes: 4 serial: &lt;filter&gt; temp: 32.9 C
    ID-2: /dev/sda vendor: Seagate model: ST2000DM006-2DM164 size: 1.82 TiB
    speed: 6.0 Gb/s serial: &lt;filter&gt;

    Partition:

    ID-1: / size: 1.38 TiB used: 504.08 GiB (35.7%) fs: ext4 dev: /dev/nvme0n1p4
    ID-2: /boot/efi size: 96 MiB used: 67.4 MiB (70.2%) fs: vfat
    dev: /dev/nvme0n1p1

    Swap:

    ID-1: swap-1 type: file size: 512 MiB used: 0 KiB (0.0%) priority: -2
    file: /swapfile

    Sensors:

    System Temperatures: cpu: 37.0 C mobo: 29.0 C
    Fan Speeds (rpm): N/A
    GPU: device: nvidia screen: :0.0 temp: 39 C fan: 0% device: amdgpu
    temp: 34.0 C

    Info:

    Memory: total: 32 GiB note: est. available: 30.45 GiB used: 3.04 GiB (10.0%)
    Processes: 480 Power: uptime: 36m wakeups: 0 Init: systemd v: 255
    target: graphical (5) default: graphical
    Packages: 3102 pm: dpkg pkgs: 3077 pm: flatpak pkgs: 7 pm: snap pkgs: 18
    Compilers: gcc: 13.3.0 Shell: Bash v: 5.2.21 running-in: konsole
    inxi: 3.3.34

    ​Thank you very much in advance!

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