After passing through the PCIE graphics card to the virtual machine, the host machine no longer displays anything. The boot logo cannot be seen during

[SilenceRet]

After passing through the PCIE graphics card to the virtual machine, the host machine no longer displays anything. The boot logo cannot be seen during startup and shutdown, and it is not possible to enter the BIOS.

After the virtual machine is turned on, the monitor can display normally, but there is no display when the host machine is turned on. Why is this happening? How can it be set back to normal?

Proxmox Virtual Environment 8.0 (ISO Image)
NVIDIA graphics card.
amd cpu.

 

[leesteken]

After passing through the PCIE graphics card to the virtual machine, the host machine no longer displays anything. The boot logo cannot be seen during startup and shutdown, and it is not possible to enter the BIOS.

After the virtual machine is turned on, the monitor can display normally, but there is no display when the host machine is turned on. Why is this happening? How can it be set back to normal?

This is normal, when you passthrough the GPU that is used during POST/boot of the system.
Proxmox unbinds the GPU from the driver and binds it to vfio-pci (which might already be done at boot if you early bind the GPU to vfio-pci) before starting the VM, but Proxmox does not do the reverse.
You can unbind vfio-pci and bind the GPU to the right drivers yourself after the VM is shutdown (via a hookscript) using Linux console commands (which depend on PCI ID), but this is not standard procedure.

 

[SilenceRet]

This is normal, when you passthrough the GPU that is used during POST/boot of the system.
Proxmox unbinds the GPU from the driver and binds it to vfio-pci (which might already be done at boot if you early bind the GPU to vfio-pci) before starting the VM, but Proxmox does not do the reverse.
You can unbind vfio-pci and bind the GPU to the right drivers yourself after the VM is shutdown (via a hookscript) using Linux console commands (which depend on PCI ID), but this is not standard procedure.

You may have misunderstood. The monitor of my host computer has been black screen since it was turned on. It does not display the motherboard logo and I am unable to access the BIOS settings, and so on.

 

[leesteken]

You may have misunderstood. The monitor of my host computer has been black screen since it was turned on. It does not display the motherboard logo and I am unable to access the BIOS settings, and so on.

If this happens during/before the POST ("press a key to enter BIOS") then it cannot be caused by Proxmox, as that is not even booted. I don't know of any way to have Proxmox (or Linux in general) to influence that.
Maybe it's a hardware issue? Do you have replacement parts for testing (like a GPU or memory)? Does the AMD CPU have integrated graphics (and try it by removing the GPU or just connecting the display to it)? Can you reset CMOS?

 

[SilenceRet]

If this happens during/before the POST ("press a key to enter BIOS") then it cannot be caused by Proxmox, as that is not even booted. I don't know of any way to have Proxmox (or Linux in general) to influence that.
Maybe it's a hardware issue? Do you have replacement parts for testing (like a GPU or memory)? Does the AMD CPU have integrated graphics (and try it by removing the GPU or just connecting the display to it)? Can you reset CMOS?

I just reset the CMOS, and now the display is working. I'm not sure what caused the issue in the first place. Thank you for your assistance.

 

[LnxBil]

I just reset the CMOS, and now the display is working. I'm not sure what caused the issue in the first place. Thank you for your assistance.

Glad it worked. Sometimes you can configure the gpu in the bios where it should display its contents, maybe look if it is the case.