The VM has a serial terminal as output. I also tried none and set the VF as primary, but same same.
It seems that the VF is only recognized as a Vulkan device, so OpenVINO and Quicksync do not appear to be supported. It works perfectly with the entire B50. So I suspect that the kernel module in 6.17 does not yet support all features. Or that support still needs to be built into ffmpeg/openvino libs.
I also just tested the DKMS kernel module 2025.11.10, but same problems and a kernel warning/error:
Device private memory not supported
With vainfo i get the following:
Trying display: wayland
error: XDG_RUNTIME_DIR is invalid or not set in the environment.
Trying display: x11
error: can't connect to X server!
Trying display: drm
libva info: VA-API version 1.22.0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_22
Bus error