https://bugs.kde.org/show_bug.cgi?id=511022
Bug ID: 511022
Summary: When running two concurrent Wayland seats (seat0 →
amdgpu, seat1 → nvidia-drm), both Plasma sessions
enumerate all DRM devices. As a result, the NVIDIA
kernel driver logs WARNs about "revoke modeset
permission", and both compositors occasionally crash.
Classification: Plasma
Product: kwin
Version First 6.3.6
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
System
-------
• Debian 13, Plasma 6.3.6
• systemd 257
• Kernel 6.12.48
• NVIDIA 550.163.01, amdgpu (Ryzen 9 7950X iGPU)
• seat0: amdgpu + 1 monitor
• seat1: nvidia + 3 monitors
Symptoms
--------
- `journalctl` shows NVIDIA kernel warning:
`nv_drm_revoke_modeset_permission+0x327/0x340 [nvidia_drm]`
- `kwin_x11` / `plasmashell` / `drkonqi` sometimes crash
- Chrome under Wayland SIGILLs repeatedly (GPU process)
- Disabling one GPU or running single-seat Wayland removes the issue
Expected
--------
Each KWin instance should restrict itself to the DRM device(s) belonging to its
own seat.
Diagnostics
-----------
`loginctl seat-status seat0/seat1` correctly lists devices, yet both
compositors still appear to open `/dev/dri/card0` and `/dev/dri/card1`.
Logs and kernel WARN attached.
Related upstream discussion
----------------------------
https://forums.developer.nvidia.com/t/multi-seat-wayland-amd-nvidia-causes-nv-drm-revoke-modeset-permission-warn-and-repeated-user-space-crashes/348845
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