Screen goes off/on until completely black

I’ve conducted an update and can successfully boot and log into KDE plasma. When loading the session KDE starts switching off/on for couple of times until the screen is completely black. Only the cursor is visible then.

This is my system:

[manjaro@manjaro ~]$ inxi --admin --verbosity=8 --filter --no-host --width
System:
  Kernel: 6.12.34-1-MANJARO arch: x86_64 bits: 64 compiler: gcc v: 15.1.1
    clocksource: tsc avail: hpet,acpi_pm
    parameters: BOOT_IMAGE=/boot/vmlinuz-x86_64 lang=en_US keytable=de tz=UTC
    misobasedir=manjaro misolabel=MANJARO_KDE_2504 quiet systemd.show_status=1
    splash driver=free nouveau.modeset=1 i915.modeset=1 radeon.modeset=1
  Desktop: KDE Plasma v: 6.3.5 tk: Qt v: N/A info: frameworks v: 6.15.0
    wm: kwin_x11 vt: 2 dm: SDDM Distro: Manjaro base: Arch Linux
Machine:
  Type: Desktop System: MSI product: MS-7798 v: 1.0
    serial: <superuser required>
  Mobo: MSI model: B75MA-P45 (MS-7798) v: 1.0 serial: <superuser required>
    uuid: <superuser required> UEFI: American Megatrends v: 1.9 date: 09/30/2013
Battery:
  Device-1: hidpp_battery_0 model: Logitech M720 Triathlon Multi-Device Mouse
    serial: <filter> charge: 100% (should be ignored) rechargeable: yes
    status: discharging
Memory:
  System RAM: total: 24 GiB available: 23.4 GiB used: 2.94 GiB (12.5%)
  Message: For most reliable report, use superuser + dmidecode.
  Array-1: capacity: 32 GiB slots: 4 modules: 4 EC: None
    max-module-size: 8 GiB note: est.
  Device-1: ChannelA-DIMM0 type: DDR3 detail: synchronous size: 4 GiB
    speed: 1333 MT/s volts: N/A width (bits): data: 64 total: 64
    manufacturer: Corsair part-no: CML8GX3M2A1600C9 serial: N/A
  Device-2: ChannelA-DIMM1 type: DDR3 detail: synchronous size: 8 GiB
    speed: 1333 MT/s volts: N/A width (bits): data: 64 total: 64
    manufacturer: Hynix/Hyundai part-no: HMT41GU6AFR8A-PB serial: <filter>
  Device-3: ChannelB-DIMM0 type: DDR3 detail: synchronous size: 4 GiB
    speed: 1333 MT/s volts: N/A width (bits): data: 64 total: 64
    manufacturer: Corsair part-no: CML8GX3M2A1600C9 serial: N/A
  Device-4: ChannelB-DIMM1 type: DDR3 detail: synchronous size: 8 GiB
    speed: 1333 MT/s volts: N/A width (bits): data: 64 total: 64
    manufacturer: Hynix/Hyundai part-no: HMT41GU6AFR8A-PB serial: <filter>
PCI Slots:
  Permissions: Unable to run dmidecode. Root privileges required.
CPU:
  Info: model: Intel Core i5-3450S bits: 64 type: MCP arch: Ivy Bridge
    gen: core 3 level: v2 built: 2012-15 process: Intel 22nm family: 6
    model-id: 0x3A (58) stepping: 9 microcode: 0x21
  Topology: cpus: 1x dies: 1 clusters: 4 cores: 4 smt: <unsupported> cache:
    L1: 256 KiB desc: d-4x32 KiB; i-4x32 KiB L2: 1024 KiB desc: 4x256 KiB
    L3: 6 MiB desc: 1x6 MiB
  Speed (MHz): avg: 1599 min/max: 1600/3500 scaling: driver: intel_cpufreq
    governor: schedutil cores: 1: 1599 2: 1599 3: 1599 4: 1599 bogomips: 22404
  Flags: acpi aes aperfmperf apic arat arch_perfmon avx bts clflush cmov
    constant_tsc cpuid cpuid_fault cx16 cx8 de ds_cpl dtes64 dtherm dts epb
    ept erms est f16c flexpriority flush_l1d fpu fsgsbase fxsr ht ibpb ibrs
    ida lahf_lm lm mca mce md_clear mmx monitor msr mtrr nonstop_tsc nopl nx
    pae pat pbe pcid pclmulqdq pdcm pebs pge pln pni popcnt pse pse36 pti pts
    rdrand rdtscp rep_good sep smep ss ssbd sse sse2 sse4_1 sse4_2 ssse3 stibp
    syscall tm tm2 tpr_shadow tsc tsc_deadline_timer vme vmx vnmi vpid xsave
    xsaveopt xtopology xtpr
  Vulnerabilities:
  Type: gather_data_sampling status: Not affected
  Type: indirect_target_selection status: Not affected
  Type: itlb_multihit status: KVM: Split huge pages
  Type: l1tf mitigation: PTE Inversion; VMX: conditional cache flushes, SMT
    disabled
  Type: mds mitigation: Clear CPU buffers; SMT disabled
  Type: meltdown mitigation: PTI
  Type: mmio_stale_data status: Unknown: No mitigations
  Type: reg_file_data_sampling status: Not affected
  Type: retbleed status: Not affected
  Type: spec_rstack_overflow status: Not affected
  Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via
    prctl
  Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer
    sanitization
  Type: spectre_v2 mitigation: Retpolines; IBPB: conditional; IBRS_FW;
    STIBP: disabled; RSB filling; PBRSB-eIBRS: Not affected; BHI: Not affected
  Type: srbds status: Vulnerable: No microcode
  Type: tsx_async_abort status: Not affected
Graphics:
  Device-1: NVIDIA GA106 [GeForce RTX 3060 Lite Hash Rate]
    vendor: Micro-Star MSI driver: nouveau v: kernel non-free: 550-570.xx+
    status: current (as of 2025-04; EOL~2026-12-xx) arch: Ampere code: GAxxx
    process: TSMC n7 (7nm) built: 2020-2023 pcie: gen: 2 speed: 5 GT/s
    lanes: 16 link-max: gen: 4 speed: 16 GT/s ports: active: HDMI-A-1
    empty: DP-1,DP-2,DP-3 bus-ID: 01:00.0 chip-ID: 10de:2504 class-ID: 0300
  Display: x11 server: X.Org v: 21.1.18 with: Xwayland v: 24.1.8
    compositor: kwin_x11 driver: X: loaded: modesetting alternate: fbdev,vesa
    dri: zink gpu: nouveau display-ID: :0 screens: 1
  Screen-1: 0 s-res: 2560x1440 s-dpi: 96 s-size: 677x381mm (26.65x15.00")
    s-diag: 777mm (30.58")
  Monitor-1: HDMI-A-1 mapped: HDMI-1 model: Idek Iiyama PL2792Q
    serial: <filter> built: 2021 res: mode: 2560x1440 hz: 60 scale: 100% (1)
    dpi: 109 gamma: 1.2 chroma: red: x: 0.671 y: 0.333 green: x: 0.298 y: 0.627
    blue: x: 0.141 y: 0.051 white: x: 0.322 y: 0.329
    size: 597x336mm (23.5x13.23") diag: 685mm (27") ratio: 16:9
    modes: 2560x1440, 2048x1280, 1920x1200, 1920x1080, 1600x1200, 1680x1050,
    1600x900, 1280x1024, 1440x900, 1280x720, 1024x768, 800x600, 720x576,
    720x480, 640x480
  API: EGL v: 1.5 platforms: device: 0 drv: zink device: 1 drv: swrast gbm:
    drv: zink surfaceless: drv: zink x11: drv: zink inactive: wayland
  API: OpenGL v: 4.6 compat-v: 4.5 vendor: mesa v: 25.1.4-arch1.1 glx-v: 1.4
    direct-render: yes renderer: zink Vulkan 1.4(NVIDIA GeForce RTX 3060 (NVK
    GA106) (MESA_NVK)) device-ID: 10de:2504 memory: 11.96 GiB unified: no
  API: Vulkan v: 1.4.313 layers: N/A device: 0 type: discrete-gpu name: NVIDIA
    GeForce RTX 3060 (NVK GA106) driver: mesa nvk v: 25.1.4-arch1.1
    device-ID: 10de:2504 surfaces: N/A
  Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
    de: kscreen-console,kscreen-doctor wl: wayland-info
    x11: xdpyinfo, xprop, xrandr
Audio:
  Device-1: Intel 7 Series/C216 Family High Definition Audio
    vendor: Micro-Star MSI driver: snd_hda_intel v: kernel bus-ID: 00:1b.0
    chip-ID: 8086:1e20 class-ID: 0403
  Device-2: NVIDIA GA106 High Definition Audio vendor: Micro-Star MSI
    driver: snd_hda_intel v: kernel pcie: gen: 3 speed: 8 GT/s lanes: 16
    link-max: gen: 4 speed: 16 GT/s bus-ID: 01:00.1 chip-ID: 10de:228e
    class-ID: 0403
  API: ALSA v: k6.12.34-1-MANJARO status: kernel-api with: aoss
    type: oss-emulator tools: alsactl,alsamixer,amixer
  Server-1: JACK v: 1.9.22 status: off tools: N/A
  Server-2: PipeWire v: 1.4.5 status: active with: 1: pipewire-pulse
    status: active 2: wireplumber status: active 3: pipewire-alsa type: plugin
    tools: pactl,pw-cat,pw-cli,wpctl
Network:
  Device-1: Realtek RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet
    vendor: Micro-Star MSI driver: r8169 v: kernel pcie: gen: 1 speed: 2.5 GT/s
    lanes: 1 port: d000 bus-ID: 03:00.0 chip-ID: 10ec:8168 class-ID: 0200
  IF: enp3s0 state: down mac: <filter>
  Device-2: NetGear WNDA4100 802.11abgn 3x3:3 [Ralink RT3573]
    driver: rt2800usb type: USB rev: 2.0 speed: 480 Mb/s lanes: 1 mode: 2.0
    bus-ID: 1-3:3 chip-ID: 0846:9012 class-ID: 0000 serial: <filter>
  IF: wlp0s20u3 state: up mac: <filter>
  IP v4: <filter> type: dynamic noprefixroute scope: global
    broadcast: <filter>
  IP v6: <filter> type: dynamic noprefixroute scope: global
  IP v6: <filter> type: dynamic noprefixroute scope: global
  IP v6: <filter> type: noprefixroute scope: link
  Info: services: NetworkManager, systemd-timesyncd, wpa_supplicant
  WAN IP: <filter>
Bluetooth:
  Device-1: Cambridge Silicon Radio Bluetooth Dongle (HCI mode) driver: btusb
    v: 0.8 type: USB rev: 2.0 speed: 12 Mb/s lanes: 1 mode: 1.1 bus-ID: 1-1:2
    chip-ID: 0a12:0001 class-ID: e001
  Report: rfkill ID: hci0 rfk-id: 0 state: up address: see --recommends
Logical:
  Message: No logical block device data found.
  Device-1: tmp maj-min: 254:0 type: LUKS dm: dm-0 size: 232.59 GiB
  Components:
  p-1: sda2 maj-min: 8:2 size: 232.59 GiB
RAID:
  Message: No RAID data found.
Drives:
  Local Storage: total: 1.62 TiB used: 133.23 GiB (8.0%)
  SMART Message: Unable to run smartctl. Root privileges required.
  ID-1: /dev/sda maj-min: 8:0 vendor: Samsung model: SSD 860 EVO 250GB
    size: 232.89 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s
    tech: SSD serial: <filter> fw-rev: 4B6Q scheme: GPT
  ID-2: /dev/sdb maj-min: 8:16 vendor: Samsung model: SSD 870 EVO 1TB
    size: 931.51 GiB block-size: physical: 512 B logical: 512 B speed: 1.5 Gb/s
    tech: SSD serial: <filter> fw-rev: 3B6Q scheme: GPT
  ID-3: /dev/sdc maj-min: 8:32 vendor: Samsung model: SSD 860 EVO 500GB
    size: 465.76 GiB block-size: physical: 512 B logical: 512 B speed: 3.0 Gb/s
    tech: SSD serial: <filter> fw-rev: 1B6Q scheme: GPT
  ID-4: /dev/sdd maj-min: 8:48 vendor: SanDisk model: Ultra Fit
    size: 28.64 GiB block-size: physical: 512 B logical: 512 B type: USB rev: 3.0
    spd: 5 Gb/s lanes: 1 mode: 3.2 gen-1x1 tech: N/A serial: <filter>
    fw-rev: 1.00 scheme: MBR
  SMART Message: Unknown USB bridge. Flash drive/Unsupported enclosure?
  Message: No optical or floppy data found.
Partition:
  ID-1: /mnt raw-size: 232.59 GiB size: 227.88 GiB (97.98%)
    used: 133.23 GiB (58.5%) fs: ext4 dev: /dev/dm-0 maj-min: 254:0 mapped: tmp
    label: N/A uuid: N/A
  ID-2: /mnt/boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%)
    used: 472 KiB (0.2%) fs: vfat dev: /dev/sda1 maj-min: 8:1 label: NO_LABEL
    uuid: 04E7-F02F
Swap:
  Alert: No swap data was found.
Unmounted:
  ID-1: /dev/sdd1 maj-min: 8:49 size: 4.13 GiB fs: iso9660
  ID-2: /dev/sdd2 maj-min: 8:50 size: 4 MiB fs: vfat label: MISO_EFI
    uuid: ECC9-5CDB
USB:
  Hub-1: 1-0:1 info: hi-speed hub with single TT ports: 4 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 1d6b:0002
    class-ID: 0900
  Device-1: 1-1:2 info: Cambridge Silicon Radio Bluetooth Dongle (HCI mode)
    type: bluetooth driver: btusb interfaces: 2 rev: 2.0
    speed: 12 Mb/s (1.4 MiB/s) lanes: 1 mode: 1.1 power: 100mA
    chip-ID: 0a12:0001 class-ID: e001
  Device-2: 1-3:3 info: NetGear WNDA4100 802.11abgn 3x3:3 [Ralink RT3573]
    type: Network driver: rt2800usb interfaces: 1 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 power: 450mA
    chip-ID: 0846:9012 class-ID: 0000 serial: <filter>
  Hub-2: 1-4:4 info: Huasheng USB2.0 HUB ports: 4 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 power: 100mA
    chip-ID: 214b:7250 class-ID: 0900
  Hub-3: 1-4.3:5 info: Monterey BakkerElkhuizen Wired Keyboard S-board 840
    Design USB-Hub ports: 3 rev: 2.0 speed: 480 Mb/s (57.2 MiB/s) lanes: 1
    mode: 2.0 power: 100mA chip-ID: 0566:3020 class-ID: 0900
  Device-1: 1-4.3.2:6 info: Logitech Unifying Receiver
    type: keyboard,mouse,HID driver: logitech-djreceiver,usbhid interfaces: 3
    rev: 2.0 speed: 12 Mb/s (1.4 MiB/s) lanes: 1 mode: 1.1 power: 98mA
    chip-ID: 046d:c52b class-ID: 0300
  Device-2: 1-4.3.3:7 info: Monterey BakkerElkhuizen Wired Keyboard S-board
    840 Design type: keyboard,HID driver: hid-generic,usbhid interfaces: 2
    rev: 1.1 speed: 1.5 Mb/s (183 KiB/s) lanes: 1 mode: 1.0 power: 100mA
    chip-ID: 0566:3013 class-ID: 0300
  Hub-4: 2-0:1 info: full speed or root hub ports: 2 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 1d6b:0002
    class-ID: 0900
  Hub-5: 2-1:2 info: Intel Integrated Rate Matching Hub ports: 6 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 8087:0024
    class-ID: 0900
  Hub-6: 2-1.5:3 info: Realtek 4-Port USB 2.0 Hub ports: 2 rev: 2.1
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 0bda:5412
    class-ID: 0900
  Hub-7: 3-0:1 info: super-speed hub ports: 4 rev: 3.0
    speed: 5 Gb/s (596.0 MiB/s) lanes: 1 mode: 3.2 gen-1x1 chip-ID: 1d6b:0003
    class-ID: 0900
  Device-1: 3-2:2 info: SanDisk Ultra Fit type: mass storage
    driver: usb-storage interfaces: 1 rev: 3.0 speed: 5 Gb/s (596.0 MiB/s)
    lanes: 1 mode: 3.2 gen-1x1 power: 896mA chip-ID: 0781:5583 class-ID: 0806
    serial: <filter>
  Hub-8: 4-0:1 info: full speed or root hub ports: 2 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 1d6b:0002
    class-ID: 0900
  Hub-9: 4-1:2 info: Intel Integrated Rate Matching Hub ports: 6 rev: 2.0
    speed: 480 Mb/s (57.2 MiB/s) lanes: 1 mode: 2.0 chip-ID: 8087:0024
    class-ID: 0900
Sensors:
  System Temperatures: cpu: 36.0 C mobo: N/A
  Fan Speeds (rpm): N/A
Repos:
  Packages: pm: pacman pkgs: 1258 libs: 329 tools: pamac pm: flatpak pkgs: 0
  Active pacman repo servers in: /etc/pacman.d/mirrorlist
    1: https://mirrors.sonic.net/manjaro/stable/$repo/$arch
    2: https://mirror.yandex.ru/mirrors/manjaro/stable/$repo/$arch
    3: https://ba.mirror.garr.it/mirrors/manjaro/stable/$repo/$arch
    4: https://manjaro.mirror.wearetriple.com/stable/$repo/$arch
    5: http://ftp.uni-kl.de/pub/linux/manjaro/stable/$repo/$arch
    6: https://ask4.mm.fcix.net/manjaro/stable/$repo/$arch
    7: http://ftp.belnet.be/mirrors/manjaro/repos/stable/$repo/$arch
    8: https://ftp.cc.uoc.gr/mirrors/linux/manjaro/stable/$repo/$arch
    9: https://opencolo.mm.fcix.net/manjaro/stable/$repo/$arch
    10: http://ftp.rz.tu-bs.de/pub/mirror/manjaro.org/repos/stable/$repo/$arch
    11: https://mirror.koddos.net/manjaro/stable/$repo/$arch
    12: https://mirror1.sox.rs/manjaro/stable/$repo/$arch
    13: http://ftp.free.org/mirrors/repo.manjaro.org/repos/stable/$repo/$arch
    14: https://mirror.kku.ac.th/manjaro/stable/$repo/$arch
    15: https://mirror.kamtv.ru/manjaro/stable/$repo/$arch
    16: https://ohioix.mm.fcix.net/manjaro/stable/$repo/$arch
    17: https://manjaro.c3sl.ufpr.br/stable/$repo/$arch
    18: https://mirror.vinehost.net/manjaro/stable/$repo/$arch
    19: https://mirror.aarnet.edu.au/pub/manjaro/stable/$repo/$arch
    20: http://mirror.terrahost.no/linux/manjaro/stable/$repo/$arch
    21: https://repo.iut.ac.ir/repo/manjaro/stable/$repo/$arch
    22: http://kartolo.sby.datautama.net.id/manjaro/stable/$repo/$arch
    23: https://repos.silknet.com/manjaro/stable/$repo/$arch
    24: https://volico.mm.fcix.net/manjaro/stable/$repo/$arch
    25: http://ftp.snt.utwente.nl/pub/linux/manjaro/stable/$repo/$arch
    26: http://ftp.tu-chemnitz.de/pub/linux/manjaro/stable/$repo/$arch
    27: https://mirror.freedif.org/Manjaro/stable/$repo/$arch
    28: https://muug.ca/mirror/manjaro/stable/$repo/$arch
    29: https://mirrors.ucr.ac.cr/manjaro/stable/$repo/$arch
    30: https://quantum-mirror.hu/mirrors/pub/manjaro/stable/$repo/$arch
    31: https://mirrors.sjtug.sjtu.edu.cn/manjaro/stable/$repo/$arch
    32: https://mirror.telepoint.bg/manjaro/stable/$repo/$arch
    33: https://mirror.truenetwork.ru/manjaro/stable/$repo/$arch
    34: https://mirrors.xtom.jp/manjaro/stable/$repo/$arch
    35: https://mirror.ibakerserver.pt/manjaro/stable/$repo/$arch
    36: https://bd.mirror.vanehost.com/Manjaro/stable/$repo/$arch
    37: https://mirrors.gigenet.com/manjaro/stable/$repo/$arch
    38: https://mirrors.dotsrc.org/manjaro/stable/$repo/$arch
    39: https://mirrors.ocf.berkeley.edu/manjaro/stable/$repo/$arch
    40: https://mirror.csclub.uwaterloo.ca/manjaro/stable/$repo/$arch
    41: https://mirrors.xtom.de/manjaro/stable/$repo/$arch
    42: https://mirror.komelt.dev/manjaro/stable/$repo/$arch
    43: https://ipng.mm.fcix.net/manjaro/stable/$repo/$arch
    44: https://mirror.alpix.eu/manjaro/stable/$repo/$arch
    45: https://nnenix.mm.fcix.net/manjaro/stable/$repo/$arch
    46: https://manjaro.ipacct.com/manjaro/stable/$repo/$arch
    47: https://manjarolinux-mirror.cloud.mu/stable/$repo/$arch
    48: https://mirror.futureweb.be/manjaro/stable/$repo/$arch
    49: https://cofractal-ewr.mm.fcix.net/manjaro/stable/$repo/$arch
    50: http://mirror.fcix.net/manjaro/stable/$repo/$arch
    51: https://manjaro.ynh.ovh/stable/$repo/$arch
    52: http://ftp.dei.uc.pt/pub/linux/manjaro/stable/$repo/$arch
    53: https://mirror.it4i.cz/manjaro/stable/$repo/$arch
    54: http://manjaro.mirrors.uk2.net/stable/$repo/$arch
    55: https://mirror.dc.uz/manjaro/stable/$repo/$arch
    56: https://mirrors.nic.cz/manjaro/stable/$repo/$arch
    57: https://coresite.mm.fcix.net/manjaro/stable/$repo/$arch
    58: https://mirror.ufro.cl/manjaro/stable/$repo/$arch
    59: https://mirrors.aliyun.com/manjaro/stable/$repo/$arch
    60: https://mirror.albony.xyz/manjaro/stable/$repo/$arch
    61: https://ftp.linux.org.tr/manjaro/stable/$repo/$arch
    62: https://mirrors.piconets.webwerks.in/manjaro-mirror/stable/$repo/$arch
    63: https://mirror.leitecastro.com/manjaro/stable/$repo/$arch
    64: https://ftp.nluug.nl/pub/os/Linux/distr/manjaro/stable/$repo/$arch
    65: http://mirror.is.co.za/mirrors/manjaro.org/stable/$repo/$arch
    66: https://codingflyboy.mm.fcix.net/manjaro/stable/$repo/$arch
    67: https://mirror.netcologne.de/manjaro/stable/$repo/$arch
    68: https://mirror.archlinux.tw/Manjaro/stable/$repo/$arch
    69: https://mnvoip.mm.fcix.net/manjaro/stable/$repo/$arch
    70: https://uvermont.mm.fcix.net/manjaro/stable/$repo/$arch
    71: https://mirrors.up.pt/pub/manjaro/stable/$repo/$arch
    72: https://ziply.mm.fcix.net/manjaro/stable/$repo/$arch
    73: https://mirror.init7.net/manjaro/stable/$repo/$arch
    74: https://mirror.phoepsilonix.love/manjaro/stable/$repo/$arch
    75: https://ftp.caliu.cat/pub/distribucions/manjaro/stable/$repo/$arch
    76: https://mirrors.atlas.net.co/manjaro/stable/$repo/$arch
    77: https://mirrors.pku.edu.cn/manjaro/stable/$repo/$arch
    78: http://ftp.riken.jp/Linux/manjaro/stable/$repo/$arch
    79: https://forksystems.mm.fcix.net/manjaro/stable/$repo/$arch
    80: https://manjaro.kurdy.org/stable/$repo/$arch
    81: https://nocix.mm.fcix.net/manjaro/stable/$repo/$arch
    82: https://fosszone.csd.auth.gr/manjaro/stable/$repo/$arch
    83: https://mirrors.ustc.edu.cn/manjaro/stable/$repo/$arch
    84: https://mirror.dkm.cz/manjaro/stable/$repo/$arch
    85: https://repo.ialab.dsu.edu/manjaro/stable/$repo/$arch
    86: https://mirrors.jlu.edu.cn/manjaro/stable/$repo/$arch
    87: https://mirror.nyist.edu.cn/manjaro/stable/$repo/$arch
    88: https://mirror.ufam.edu.br/manjaro/stable/$repo/$arch
    89: https://mirror.hostiko.network/manjaro/stable/$repo/$arch
    90: http://manjaro.grena.ge/stable/$repo/$arch
    91: https://mirrors.cicku.me/manjaro/stable/$repo/$arch
    92: http://ftp.tsukuba.wide.ad.jp/Linux/manjaro/stable/$repo/$arch
    93: https://ftp.gwdg.de/pub/linux/manjaro/stable/$repo/$arch
    94: https://mirrors.manjaro.org/repo/stable/$repo/$arch
    95: https://mirrors.eric.ovh/manjaro/stable/$repo/$arch
    96: http://free.nchc.org.tw/manjaro/stable/$repo/$arch
    97: https://mirror.raiolanetworks.com/manjaro/stable/$repo/$arch
    98: https://mirrors.ft.uam.es/manjaro/stable/$repo/$arch
    99: https://ftp.lysator.liu.se/pub/manjaro/stable/$repo/$arch
    100: https://mirror.2degrees.nz/manjaro/stable/$repo/$arch
    101: https://mirror.23m.com/manjaro/stable/$repo/$arch
    102: https://manjaro.mirrors.lavatech.top/stable/$repo/$arch
    103: https://mirror.nju.edu.cn/manjaro/stable/$repo/$arch
    104: https://mirror.bardia.tech/manjaro/stable/$repo/$arch
    105: https://manjaro.repo.cure.edu.uy/stable/$repo/$arch
    106: https://edgeuno-bog2.mm.fcix.net/manjaro/stable/$repo/$arch
    107: https://www.mirrorservice.org/sites/repo.manjaro.org/repos/stable/$repo/$arch
    108: http://mirror.datacenter.by/pub/mirrors/manjaro/stable/$repo/$arch
    109: https://ftpmirror1.infania.net/mirror/manjaro/stable/$repo/$arch
    110: https://ct.mirror.garr.it/mirrors/manjaro/stable/$repo/$arch
    111: https://irltoolkit.mm.fcix.net/manjaro/stable/$repo/$arch
    112: https://gsl-syd.mm.fcix.net/manjaro/stable/$repo/$arch
    113: http://manjaro.mirror.ac.za/stable/$repo/$arch
    114: https://manjaro.mirror.liquidtelecom.com/stable/$repo/$arch
    115: https://mirror.alwyzon.net/manjaro/stable/$repo/$arch
    116: https://ridgewireless.mm.fcix.net/manjaro/stable/$repo/$arch
    117: https://manjaro.mirror.garr.it/manjaro/stable/$repo/$arch
    118: http://mirror.xeonbd.com/manjaro/stable/$repo/$arch
    119: https://southfront.mm.fcix.net/manjaro/stable/$repo/$arch
    120: http://ossmirror.mycloud.services/os/linux/manjaro/stable/$repo/$arch
    121: https://mirror.math.princeton.edu/pub/manjaro/stable/$repo/$arch
    122: https://mirror.zetup.net/manjaro/stable/$repo/$arch
    123: https://mirror.funami.tech/manjaro/stable/$repo/$arch
    124: https://mirrors.netix.net/manjaro/stable/$repo/$arch
    125: https://mirror.easyname.at/manjaro/stable/$repo/$arch
    126: https://mirror.xenyth.net/manjaro/stable/$repo/$arch
    127: https://mirrors.xtom.ee/manjaro/stable/$repo/$arch
    128: https://mirror.seahost.de/manjaro/stable/$repo/$arch
    129: https://distrohub.kyiv.ua/manjaro/stable/$repo/$arch
    130: https://ftp.psnc.pl/linux/manjaro/stable/$repo/$arch
    131: https://ftp.halifax.rwth-aachen.de/manjaro/stable/$repo/$arch
    132: https://linorg.usp.br/manjaro/stable/$repo/$arch
    133: https://mirror.bouwhuis.network/manjaro/stable/$repo/$arch
    134: https://mirrors2.manjaro.org/stable/$repo/$arch
    135: https://mirrors.tuna.tsinghua.edu.cn/manjaro/stable/$repo/$arch
Processes:
  CPU top: 5 of 230
  1: cpu: 10.6% command: firefox pid: 2011 mem: 530.7 MiB (2.2%)
  2: cpu: 4.9% command: [kworker/u16:3-phy0] pid: 4089 mem: 0.00 MiB (0.0%)
  3: cpu: 3.3% command: firefox pid: 2377 mem: 271.2 MiB (1.1%)
  4: cpu: 2.2% command: kwin_x11 pid: 1257 mem: 181.5 MiB (0.7%)
  5: cpu: 2.2% command: firefox pid: 2820 mem: 269.5 MiB (1.1%)
  Memory top: 5 of 230
  1: mem: 530.7 MiB (2.2%) command: firefox pid: 2011 cpu: 10.6%
  2: mem: 360.9 MiB (1.5%) command: plasmashell pid: 1332 cpu: 1.0%
  3: mem: 280.0 MiB (1.1%) command: firefox pid: 2293 cpu: 1.2%
  4: mem: 271.2 MiB (1.1%) command: firefox pid: 2377 cpu: 3.3%
  5: mem: 269.5 MiB (1.1%) command: firefox pid: 2820 cpu: 2.2%
Info:
  Processes: 230 Power: uptime: 16m states: freeze,mem,disk suspend: deep
    avail: s2idle wakeups: 0 hibernate: platform avail: shutdown, reboot,
    suspend, test_resume image: 9.31 GiB services: org_kde_powerdevil,
    power-profiles-daemon, upowerd Init: systemd v: 257 default: graphical
    tool: systemctl
  Compilers: N/A Shell: Bash v: 5.2.37 default: Zsh v: 5.9
    running-in: konsole inxi: 3.3.38

Checking the session’s journal reveals core dumps:

Jul 18 19:32:54 schatzi-pc kernel: ksmserver-logou[1591]: segfault at 56313fb6454b ip 00007fb9be09dda8 sp 00007ffc40524280 error 4 in libQt6Quick.so.6.9.1[29dda8,7fb9bdf3e000+455000] likely on CPU 2 (core 2, socket 0)
Jul 18 19:32:54 schatzi-pc kernel: Code: ff ff ff 66 0f fe c2 f3 0f e6 c0 0f 29 85 70 ff ff ff e9 c5 fa ff ff 0f 1f 00 48 8b 7b 08 48 8b 07 ff 50 48 48 8b 10 48 89 c7 <ff> 52 78 84 c0 0f 85 74 fa ff ff c6 43 10 01 e9 6b fa ff ff 0f 1f
Jul 18 19:32:54 schatzi-pc systemd-coredump[1607]: Process 1591 (ksmserver-logou) of user 1000 terminated abnormally with signal 11/SEGV, processing...
Jul 18 19:32:54 schatzi-pc systemd[1]: Started Process Core Dump (PID 1607/UID 0).
Jul 18 19:32:54 schatzi-pc systemd-coredump[1608]: Process 1591 (ksmserver-logou) of user 1000 dumped core.
                                                   
                                                   Stack trace of thread 1591:
                                                   #0  0x00007fb9be09dda8 _ZN25QSGSoftwareRenderableNode6updateEv (libQt6Quick.so.6 + 0x29dda8)
                                                   #1  0x00007fb9be094e55 _ZN27QSGAbstractSoftwareRenderer11nodeChangedEP7QSGNode6QFlagsINS0_13DirtyStateBitEE (libQt6Quick.so.6 + 0x294e55)
                                                   #2  0x00007fb9be0e2cd8 _ZN7QSGNode9markDirtyE6QFlagsINS_13DirtyStateBitEE (libQt6Quick.so.6 + 0x2e2cd8)
                                                   #3  0x00007fb9aec4eb3b n/a (libKirigamiPrimitives.so.6 + 0x1fb3b)
                                                   #4  0x00007fb9be0e51c4 _ZN11QSGRenderer10preprocessEv (libQt6Quick.so.6 + 0x2e51c4)
                                                   #5  0x00007fb9be0e6727 n/a (libQt6Quick.so.6 + 0x2e6727)
                                                   #6  0x00007fb9be07a68c _ZN19QQuickWindowPrivate16renderSceneGraphEv (libQt6Quick.so.6 + 0x27a68c)
                                                   #7  0x00007fb9be0aca10 n/a (libQt6Quick.so.6 + 0x2aca10)
                                                   #8  0x00007fb9be07b9e5 _ZN12QQuickWindow5eventEP6QEvent (libQt6Quick.so.6 + 0x27b9e5)
                                                   #9  0x00007fb9bc768118 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt6Core.so.6 + 0x168118)
                                                   #10 0x00007fb9bcfe9828 _ZN15QPlatformWindow20deliverUpdateRequestEv (libQt6Gui.so.6 + 0x1e9828)
                                                   #11 0x00007fb9bcfe5d65 _ZN15QPlatformWindow11windowEventEP6QEvent (libQt6Gui.so.6 + 0x1e5d65)
                                                   #12 0x00007fb9bcf94901 _ZN15QGuiApplication6notifyEP7QObjectP6QEvent (libQt6Gui.so.6 + 0x194901)
                                                   #13 0x00007fb9bc768118 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent (libQt6Core.so.6 + 0x168118)
                                                   #14 0x00007fb9bc91bc6f _ZN14QTimerInfoList14activateTimersEv (libQt6Core.so.6 + 0x31bc6f)
                                                   #15 0x00007fb9bca3fc79 n/a (libQt6Core.so.6 + 0x43fc79)
                                                   #16 0x00007fb9bad1187d n/a (libglib-2.0.so.0 + 0x5e87d)
                                                   #17 0x00007fb9bad12cd7 n/a (libglib-2.0.so.0 + 0x5fcd7)
                                                   #18 0x00007fb9bad12ee5 g_main_context_iteration (libglib-2.0.so.0 + 0x5fee5)
                                                   #19 0x00007fb9bca3c5e2 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x43c5e2)
                                                   #20 0x00007fb9bc7744b6 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x1744b6)
                                                   #21 0x00007fb9bc76c7c1 _ZN16QCoreApplication4execEv (libQt6Core.so.6 + 0x16c7c1)
                                                   #22 0x000056345443adaf n/a (/usr/lib/ksmserver-logout-greeter + 0x6daf)
                                                   #23 0x00007fb9bc0376b5 n/a (libc.so.6 + 0x276b5)
                                                   #24 0x00007fb9bc037769 __libc_start_main (libc.so.6 + 0x27769)
                                                   #25 0x000056345443b055 n/a (/usr/lib/ksmserver-logout-greeter + 0x7055)
                                                   
                                                   Stack trace of thread 1599:
                                                   #0  0x00007fb9bc0ade22 n/a (libc.so.6 + 0x9de22)
                                                   #1  0x00007fb9bc0a1fda n/a (libc.so.6 + 0x91fda)
                                                   #2  0x00007fb9bc0a2024 n/a (libc.so.6 + 0x92024)
                                                   #3  0x00007fb9bc11c5a6 ppoll (libc.so.6 + 0x10c5a6)
                                                   #4  0x00007fb9bad12e04 n/a (libglib-2.0.so.0 + 0x5fe04)
                                                   #5  0x00007fb9bad12ee5 g_main_context_iteration (libglib-2.0.so.0 + 0x5fee5)
                                                   #6  0x00007fb9bca3c5e2 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x43c5e2)
                                                   #7  0x00007fb9bc7744b6 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x1744b6)
                                                   #8  0x00007fb9bc88e054 _ZN7QThread3runEv (libQt6Core.so.6 + 0x28e054)
                                                   #9  0x00007fb9bc91ee69 n/a (libQt6Core.so.6 + 0x31ee69)
                                                   #10 0x00007fb9bc0a57eb n/a (libc.so.6 + 0x957eb)
                                                   #11 0x00007fb9bc12918c n/a (libc.so.6 + 0x11918c)
                                                   
                                                   Stack trace of thread 1605:
                                                   #0  0x00007fb9bc0ade22 n/a (libc.so.6 + 0x9de22)
                                                   #1  0x00007fb9bc0a1fda n/a (libc.so.6 + 0x91fda)
                                                   #2  0x00007fb9bc0a264c n/a (libc.so.6 + 0x9264c)
                                                   #3  0x00007fb9bc0a4f28 pthread_cond_timedwait (libc.so.6 + 0x94f28)
                                                   #4  0x00007fb9bc92dd25 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x32dd25)
                                                   #5  0x00007fb9bc927c40 n/a (libQt6Core.so.6 + 0x327c40)
                                                   #6  0x00007fb9bc91ee69 n/a (libQt6Core.so.6 + 0x31ee69)
                                                   #7  0x00007fb9bc0a57eb n/a (libc.so.6 + 0x957eb)
                                                   #8  0x00007fb9bc12918c n/a (libc.so.6 + 0x11918c)
                                                   
                                                   Stack trace of thread 1592:
                                                   #0  0x00007fb9bc0ade22 n/a (libc.so.6 + 0x9de22)
                                                   #1  0x00007fb9bc0a1fda n/a (libc.so.6 + 0x91fda)
                                                   #2  0x00007fb9bc0a2024 n/a (libc.so.6 + 0x92024)
                                                   #3  0x00007fb9bc11c5a6 ppoll (libc.so.6 + 0x10c5a6)
                                                   #4  0x00007fb9bad12e04 n/a (libglib-2.0.so.0 + 0x5fe04)
                                                   #5  0x00007fb9bad12ee5 g_main_context_iteration (libglib-2.0.so.0 + 0x5fee5)
                                                   #6  0x00007fb9bca3c5e2 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt6Core.so.6 + 0x43c5e2)
                                                   #7  0x00007fb9bc7744b6 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt6Core.so.6 + 0x1744b6)
                                                   #8  0x00007fb9bc8873c6 _ZN7QThread4execEv (libQt6Core.so.6 + 0x2873c6)
                                                   #9  0x00007fb9bd77adae n/a (libQt6DBus.so.6 + 0x37dae)
                                                   #10 0x00007fb9bc91ee69 n/a (libQt6Core.so.6 + 0x31ee69)
                                                   #11 0x00007fb9bc0a57eb n/a (libc.so.6 + 0x957eb)
                                                   #12 0x00007fb9bc12918c n/a (libc.so.6 + 0x11918c)
                                                   
                                                   Stack trace of thread 1601:
                                                   #0  0x00007fb9bc0ade22 n/a (libc.so.6 + 0x9de22)
                                                   #1  0x00007fb9bc0a1fda n/a (libc.so.6 + 0x91fda)
                                                   #2  0x00007fb9bc0a264c n/a (libc.so.6 + 0x9264c)
                                                   #3  0x00007fb9bc0a4f28 pthread_cond_timedwait (libc.so.6 + 0x94f28)
                                                   #4  0x00007fb9bc92dd25 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x32dd25)
                                                   #5  0x00007fb9bc927c40 n/a (libQt6Core.so.6 + 0x327c40)
                                                   #6  0x00007fb9bc91ee69 n/a (libQt6Core.so.6 + 0x31ee69)
                                                   #7  0x00007fb9bc0a57eb n/a (libc.so.6 + 0x957eb)
                                                   #8  0x00007fb9bc12918c n/a (libc.so.6 + 0x11918c)
                                                   
                                                   Stack trace of thread 1606:
                                                   #0  0x00007fb9bc0ade22 n/a (libc.so.6 + 0x9de22)
                                                   #1  0x00007fb9bc0a1fda n/a (libc.so.6 + 0x91fda)
                                                   #2  0x00007fb9bc0a264c n/a (libc.so.6 + 0x9264c)
                                                   #3  0x00007fb9bc0a4f28 pthread_cond_timedwait (libc.so.6 + 0x94f28)
                                                   #4  0x00007fb9bc92dd25 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x32dd25)
                                                   #5  0x00007fb9bc927c40 n/a (libQt6Core.so.6 + 0x327c40)
                                                   #6  0x00007fb9bc91ee69 n/a (libQt6Core.so.6 + 0x31ee69)
                                                   #7  0x00007fb9bc0a57eb n/a (libc.so.6 + 0x957eb)
                                                   #8  0x00007fb9bc12918c n/a (libc.so.6 + 0x11918c)
                                                   
                                                   Stack trace of thread 1593:
                                                   #0  0x00007fb9bc0ade22 n/a (libc.so.6 + 0x9de22)
                                                   #1  0x00007fb9bc0a1fda n/a (libc.so.6 + 0x91fda)
                                                   #2  0x00007fb9bc0a2024 n/a (libc.so.6 + 0x92024)
                                                   #3  0x00007fb9bc11c05e __poll (libc.so.6 + 0x10c05e)
                                                   #4  0x00007fb9bd72520b n/a (libxcb.so.1 + 0xd20b)
                                                   #5  0x00007fb9bd726f3d xcb_wait_for_event (libxcb.so.1 + 0xef3d)
                                                   #6  0x00007fb9b5fb56e9 n/a (libQt6XcbQpa.so.6 + 0x566e9)
                                                   #7  0x00007fb9bc91ee69 n/a (libQt6Core.so.6 + 0x31ee69)
                                                   #8  0x00007fb9bc0a57eb n/a (libc.so.6 + 0x957eb)
                                                   #9  0x00007fb9bc12918c n/a (libc.so.6 + 0x11918c)
                                                   
                                                   Stack trace of thread 1602:
                                                   #0  0x00007fb9bc0ade22 n/a (libc.so.6 + 0x9de22)
                                                   #1  0x00007fb9bc0a1fda n/a (libc.so.6 + 0x91fda)
                                                   #2  0x00007fb9bc0a264c n/a (libc.so.6 + 0x9264c)
                                                   #3  0x00007fb9bc0a4f28 pthread_cond_timedwait (libc.so.6 + 0x94f28)
                                                   #4  0x00007fb9bc92dd25 _ZN14QWaitCondition4waitEP6QMutex14QDeadlineTimer (libQt6Core.so.6 + 0x32dd25)
                                                   #5  0x00007fb9bc927c40 n/a (libQt6Core.so.6 + 0x327c40)
                                                   #6  0x00007fb9bc91ee69 n/a (libQt6Core.so.6 + 0x31ee69)
                                                   #7  0x00007fb9bc0a57eb n/a (libc.so.6 + 0x957eb)
                                                   #8  0x00007fb9bc12918c n/a (libc.so.6 + 0x11918c)
                                                   ELF object binary architecture: AMD x86-64
Jul 18 19:32:54 schatzi-pc systemd[1]: systemd-coredump@3-1607-0.service: Deactivated successfully.
Jul 18 19:32:54 schatzi-pc systemd[1]: systemd-coredump@3-1607-0.service: Consumed 317ms CPU time, 105.6M memory peak.
Jul 18 19:32:54 schatzi-pc systemd[910]: dbus-:1.2-org.kde.LogoutPrompt@0.service: Main process exited, code=dumped, status=11/SEGV
Jul 18 19:32:54 schatzi-pc systemd[910]: dbus-:1.2-org.kde.LogoutPrompt@0.service: Failed with result 'core-dump'.

I’d be happy to share the full journal. Should I post it here?

What is going on here? Can someone help?

Should I rewrite the title in order to better highlight the observed segfault of ksmserver-logout?