when you install an NVidia GPU to run HPC tasks you usually don’t want that X11/xorg use it. This can be done by force Xorg to use the framebuffer device and prevent the nvidia_drm driver from creating a framebuffer device.
You can check this by nvidia-smi
root@debdev ~ # nvidia-smi
+---------------------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=======================================================================================|
| 0 N/A N/A 1581 G /usr/lib/xorg/Xorg 167MiB |
| 0 N/A N/A 1713 G /usr/bin/gnome-shell 16MiB |
+---------------------------------------------------------------------------------------+
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