Hi,

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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