https://bugs.kde.org/show_bug.cgi?id=496738
Bug ID: 496738
Summary: kwin_wayland don't release /dev/nvidia0 after sending
'remove' to udev event
Classification: Plasma
Product: kwin
Version: unspecified
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: platform-drm
Assignee: kwin-bugs-n...@kde.org
Reporter: g311571...@gmail.com
Target Milestone: ---
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.
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