SUMMARY Sending 'remove' to nvidia driver will update screen output, but kwin_wayland process is still using /dev/nvidia0 so I can't remove nvidia driver. STEPS TO REPRODUCE 1. echo -n "remove" > /sys/bus/pci/devices/0000:01:00.0/drm/card0/uevent 2. fuser -v /dev/nvidia0 OBSERVED RESULT USER PID ACCESS COMMAND /dev/nvidia0: heddxh 1354 F...m kwin_wayland heddxh 13461 F.... electron Running nvidia-smi show "No running processes found". So due to there are processes using this device, I can't remove nvidia driver. If I run `echo "$gpu" > "/sys/bus/pci/devices/$gpu/driver/unbind"` , system will hang with kernel warning spamming the journal. EXPECTED RESULT kwin_wayland will release the nvidia card when receiving remove udev event. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 6.2.3 KDE Frameworks Version: 6.8.0 Qt Version: 6.8.0 Kernel Version: 6.11.9-arch1-1 (64-bit) Graphics Platform: Wayland Processors: 20 × 12th Gen Intel® Core™ i7-12700H Memory: 15.3 GiB of RAM Graphics Processor: Mesa Intel® Graphics Manufacturer: HP Product Name: OMEN by HP Laptop 16-b1xxx ADDITIONAL INFORMATION My system is hybrid gpu, intel + nvidia, booting gpu in intel. I want to dynamically binding my nvidia card to vfio-pci, and can also rebind to nvidia driver when vm is off and I want to use it on host. I also have __EGL_VENDOR_IBRARY_FILENAMES=/usr/share/glvnd/egl_vendor.d/50_mesa.json as env var to avoid EGL program using nvidia card. And I pass Environment="KWIN_DRM_DEVICES=/dev/dri/card1:/dev/dri/card0" to kwin_wayland, card0 is nvidia and card1 is intel.
Does this still happen in Plasma 6.4? KWin has code to clean up all resources when a GPU is removed, so it shouldn't be used anymore after a remove event. If it does still happen, please attach the output of journalctl --user-unit plasma-kwin_wayland --boot 0 after sending the remove event.
It seems fixed on Plasma 6.4 Thank you !