https://bugs.kde.org/show_bug.cgi?id=511852

gman <[email protected]> changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #3 from gman <[email protected]> ---
Hi there, same bug here in Fedora, using kwin Version 6.5.5, Release 1.fc43.
Laptop with a integrated amd gpu, a discrete nvidia gpu and an external
monitor.
Same errors in logs. There _seems_ to be no regressions related to these
errors, but still, there must be a reason for the errors to occur.

I've found a topic which describes possible reason and a workaround:
https://bbs.archlinux.org/viewtopic.php?id=310531
> tell KWin in which order to prefer DRM devices for displays / compositing. I 
> want Nvidia="card1" to be used preferably.
> The goal here is to keep compositor and scan-out on one GPU, or at least a 
> path the driver likes better: define a systemd user variable: 
> systemctl --user edit plasma-kwin_wayland.service
> [Service]
> # Prefer NVIDIA (card1) over Intel (card2) for KWin because of 
> external-monitor bug
> Environment=KWIN_DRM_DEVICES=/dev/dri/card1:/dev/dri/card2
I've tried  this workaround and it indeed eliminates the errors. However, I
don't want kwin to run primarily on the nvidia gpu, so I decided against it.

from inxi:
> System:
>  Kernel: 6.18.5-200.fc43.x86_64 arch: x86_64 bits: 64 compiler: gcc v: 15.2.1
>  Desktop: KDE Plasma v: 6.5.5 Distro: Fedora Linux 43 (KDE Plasma Desktop 
> Edition)
> CPU:
> Info: 8-core model: AMD Ryzen 7 6800H with Radeon Graphics bits: 64
>  type: MT MCP arch: Zen 3+ rev: 1 cache: L1: 512 KiB L2: 4 MiB L3: 16 MiB
> Speed (MHz): avg: 1096 min/max: 404/4787 boost: enabled cores: 1: 1096
>   2: 1096 3: 1096 4: 1096 5: 1096 6: 1096 7: 1096 8: 1096 9: 1096 10: 1096
>  11: 1096 12: 1096 13: 1096 14: 1096 15: 1096 16: 1096 bogomips: 102207
> Flags-basic: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
> Graphics:
>  Device-1: NVIDIA GA104M [Geforce RTX 3070 Ti Laptop GPU] vendor: Lenovo
>    driver: nvidia v: 580.119.02 arch: Ampere bus-ID: 01:00.0
>  Device-2: Advanced Micro Devices [AMD/ATI] Rembrandt [Radeon 680M]
>    vendor: Lenovo driver: amdgpu v: kernel arch: RDNA-2 bus-ID: 35:00.0 temp: 
> 40.0 C
>  Display: wayland server: Xwayland v: 24.1.9 compositor: kwin_wayland
>  driver: X: loaded: amdgpu,nvidia unloaded: modesetting,nouveau,radeon
> dri: radeonsi gpu: amdgpu,nv_platform,nvidia,nvidia-nvswitch resolution:
> 1: 2560x1440~60Hz 2: 1920x1080
>  API: EGL v: 1.5 drivers: kms_swrast,nvidia,radeonsi,swrast platforms:
>    active: gbm,wayland,x11,surfaceless,device inactive: device-2
>  API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: amd mesa v: 25.2.7 glx-v: 1.4
>    direct-render: yes renderer: AMD Radeon 680M (radeonsi rembrandt LLVM
>    21.1.5 DRM 3.64 6.18.5-200.fc43.x86_64)
>  API: Vulkan v: 1.4.328 drivers: radv,nvidia,llvmpipe surfaces: N/A
> devices: 3
>  Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
>   de: kscreen-console,kscreen-doctor gpu: nvidia-settings,nvidia-smi
>    wl: wayland-info x11: xdriinfo, xdpyinfo, xprop, xrandr

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