Isn't this the NVIDIA proprietary driver and Mesa isn't involved at all? The code using linux-drm-syncobj-v1 is in the egl-wayland library.
Bug 1908825 Comment 11 Edit History
Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.
Isn't this the NVIDIA proprietary driver and Mesa isn't involved at all? The code using linux-drm-syncobj-v1 is in the egl-wayland library. https://github.com/NVIDIA/egl-wayland/blob/master/src/wayland-eglsurface.c#L228-L238