Screen flickering when I move mouse

I’m on KDE when trying to update it notified me that plasma-x11-session package is conflicting.
So I removed sudo pacman -R plasma-x11-session but now after restarting - when every-time I move the mouse the screen is flickering.

System info:
inxi -Fxxc0z

Summary
System: 
  Kernel: 6.18.57-1-lts arch: x86_64 bits: 64 compiler: gcc v: 16.2.1 
  Desktop: KDE Plasma v: 6.8.0 tk: Qt v: N/A wm: kwin_wayland dm: SDDM 
    Distro: EndeavourOS base: Arch Linux 
Machine: 
  Type: Desktop Mobo: INTEL model: H81 serial: <superuser required> 
    Firmware: UEFI vendor: American Megatrends v: 4.6.5 date: 07/31/2025 
CPU: 
  Info: dual core model: Intel Core i3-4170 bits: 64 type: MT MCP 
    arch: Haswell rev: 3 cache: L1: 128 KiB L2: 512 KiB L3: 3 MiB 
  Speed (MHz): avg: 3691 min/max: 800/3700 cores: 1: 3691 2: 3691 3: 3691 
    4: 3691 bogomips: 29540 
  Flags-basic: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
Graphics: 
  Device-1: NVIDIA GK208B \[GeForce GT 710\] vendor: ZOTAC driver: nouveau 
    v: kernel arch: Kepler-2 pcie: speed: 5 GT/s lanes: 8 ports: active: VGA-1 
    empty: DVI-D-1,HDMI-A-1 bus-ID: 01:00.0 chip-ID: 10de:128b temp: 50.0 C 
  Display: wayland server: X.org v: 1.21.1.25 with: Xwayland v: 24.1.14 
    compositor: kwin_wayland driver: X: loaded: modesetting 
    alternate: fbdev,nouveau,nv,vesa dri: nouveau gpu: nouveau display-ID: 1 
  Monitor-1: VGA-1 model: HP 22f res: 1920x1080 hz: 60 dpi: 102 
    diag: 546mm (21.5") 
  API: EGL v: 1.5 platforms: device: 0 drv: nouveau device: 1 drv: swrast 
    gbm: drv: nouveau surfaceless: drv: nouveau wayland: drv: nouveau x11: 
    drv: nouveau 
  API: OpenGL v: 4.6 compat-v: 4.3 vendor: mesa v: 26.2.4-arch1.1 glx-v: 1.4 
    direct-render: yes renderer: NV106 device-ID: 10de:128b 
  API: Vulkan Message: No Vulkan data available. 
  Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo 
    de: kscreen-console,kscreen-doctor wl: wayland-info 
    x11: xdpyinfo, xprop, xrandr 
Audio: 
  Device-1: Intel 8 Series/C220/C740 Series High Definition Audio 
    driver: snd_hda_intel v: kernel bus-ID: 00:1b.0 chip-ID: 8086:8c20 
  Device-2: NVIDIA GK208 HDMI/DP Audio vendor: ZOTAC driver: snd_hda_intel 
    v: kernel pcie: speed: 5 GT/s lanes: 8 bus-ID: 01:00.1 chip-ID: 10de:0e0f 
  API: ALSA v: k6.18.57-1-lts status: kernel-api 
  Server-1: sndiod v: N/A status: off 
  Server-2: PipeWire v: 1.6.9 status: active with: 1: pipewire-pulse 
    status: active 2: wireplumber status: active 3: pipewire-alsa type: plugin 
    4: pw-jack type: plugin 
Network: 
  Device-1: Realtek RTL810xE PCI Express Fast Ethernet driver: r8169 v: kernel 
    pcie: speed: 2.5 GT/s lanes: 1 port: d000 bus-ID: 03:00.0 chip-ID: 10ec:8136 
  IF: enp3s0 state: up speed: 100 Mbps duplex: full mac: <filter> 
  Device-2: TP-Link TL-WN823N v2/v3 \[Realtek RTL8192EU\] driver: rtl8xxxu 
    type: USB rev: 2.1 speed: 480 Mb/s lanes: 1 bus-ID: 2-10:4 
    chip-ID: 2357:0109 
  IF: wlan0 state: up mac: <filter> 
Drives: 
  Local Storage: total: 931.51 GiB used: 255.92 GiB (27.5%) 
  ID-1: /dev/sda vendor: Seagate model: ST1000DM003-1SB10C size: 931.51 GiB 
    speed: 3.0 Gb/s serial: <filter> 
Partition: 
  ID-1: / size: 150 GiB used: 96.64 GiB (64.4%) fs: btrfs dev: /dev/sda2 
  ID-2: /boot/efi size: 2 GiB used: 664 KiB (0.0%) fs: vfat dev: /dev/sda1 
  ID-3: /home size: 770.71 GiB used: 159.03 GiB (20.6%) fs: btrfs 
    dev: /dev/sda3 
  ID-4: /var/log size: 150 GiB used: 96.64 GiB (64.4%) fs: btrfs 
    dev: /dev/sda2 
Swap: 
  ID-1: swap-1 type: partition size: 8.8 GiB used: 244.4 MiB (2.7%) 
    priority: -2 dev: /dev/sda4 
Sensors: 
  System Temperatures: cpu: 46.0 C mobo: N/A gpu: nouveau temp: 50.0 C 
  Fan Speeds (rpm): N/A 
Info: 
  Memory: total: 8 GiB available: 7.7 GiB used: 5.69 GiB (73.9%) 
  Processes: 265 Power: uptime: 14m wakeups: 0 Init: systemd v: 262 
    default: graphical 
  Packages: pm: pacman pkgs: 1311 Compilers: clang: 23.1.1 gcc: 16.2.1 
    Shell: Bash v: 5.3.20 running-in: konsole inxi: 3.3.41

Is this already know issue and I just have to wait for next patch from KDE?

Since x11 is no longer supported on KDE beginning with 6.8, I’m not sure what to suggest here. :man_shrugging:

For now I"ll rollback to BTRFs previous snapshot and later check if they fix it.

It could maybe be another package that updated that is the culprit, maybe something to do with graphics or kernel? These are what I would guess.

Same here!!! It’s impossible to work!

simple answer < > not use it just yet or wait your time…

It’s just a bit disappointing after this exuberant advertising! So I have to stay with GNOME (?)

For me it seems to affect only Brave. Zen and other apps are ok.

try https://discuss.kde.org/t/kde-plasma-6-8-beta-2-caused-the-screen-to-go-black-flicker-movimg-constantely-stops-the-problem/50728/3

Updated to check if they fixed upstream…seems still the bug exist…from SDDM changed Automatically login with Niri+DMS for now.