Nvidia RTX 3060. I Can see the boot screen in the real monitor and web from proxmox but the X Windows does not recognize the real monitor.

[sirlordt]

I installed a Linux Mint 21.3 in VM from proxmox. I made all the config to make the passthrough of my RTX NVIDIA 3060 to the Linux Mint 21.3.

Later I installed the Nvidia driver in the VM. The Linux Mint wizard suggested "nvidia-driver-535" and installed it successfully. Later reboot I can see the green boot logo of Linux mint, in both the real and the virtual monitors. But later the lightdm started, and the real monitor stopped sending the video and entered the power-saving mode. The virtual web monitor works fine always.

Using the command in the VM Nvidia-settings, in the left panel show the monitor Dell S2240M. I can see the info on my Nvidia card. And everything in the info is correct. But when I clicked on the monitor info the right panel did not show so much info.




In the VM guest my output from my

lspci -v

...
01:00.0 VGA compatible controller: NVIDIA Corporation GA106 [GeForce RTX 3060 Lite Hash Rate] (rev a1) (prog-if 00 [VGA controller])
    Subsystem: Gigabyte Technology Co., Ltd GA106 [GeForce RTX 3060 Lite Hash Rate]
    Physical Slot: 0
    Flags: bus master, fast devsel, latency 0, IRQ 46
    Memory at fb000000 (32-bit, non-prefetchable) [size=16M]
    Memory at d0000000 (64-bit, prefetchable) [size=256M]
    Memory at e0000000 (64-bit, prefetchable) [size=32M]
    I/O ports at 5000 [size=128]
    Expansion ROM at fc000000 [virtual] [disabled] [size=512K]
    Capabilities: [60] Power Management version 3
    Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
    Capabilities: [78] Express Legacy Endpoint, MSI 00
    Capabilities: [b4] Vendor Specific Information: Len=14 <?>
    Capabilities: [100] Virtual Channel
    Capabilities: [128] Power Budgeting <?>
    Capabilities: [420] Advanced Error Reporting
    Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
    Capabilities: [bb0] Physical Resizable BAR
    Kernel driver in use: nvidia
    Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia

01:00.1 Audio device: NVIDIA Corporation Device 228e (rev a1)
    Subsystem: Gigabyte Technology Co., Ltd Device 4074
    Physical Slot: 0
    Flags: bus master, fast devsel, latency 0, IRQ 17
    Memory at fc080000 (32-bit, non-prefetchable) [size=16K]
    Capabilities: [60] Power Management version 3
    Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
    Capabilities: [78] Express Endpoint, MSI 00
    Capabilities: [100] Advanced Error Reporting
    Kernel driver in use: snd_hda_intel
    Kernel modules: snd_hda_intel
...

root@pve:~# qm config 100

boot: order=virtio0;ide2;net0
cores: 8
cpu: host
hostpci0: 0000:01:00,pcie=1
ide2: media_disk01_proxmox:iso/linuxmint-21.3-cinnamon-64bit.iso,media=cdrom,size=2995344K
machine: q35
memory: 8192
meta: creation-qemu=8.1.2,ctime=1706223769
name: linux-test-01
net0: virtio=BC:24:11:D1:20:D7,bridge=vmbr0,firewall=1
numa: 0
ostype: l26
parent: Before_NVidia
scsihw: virtio-scsi-single
smbios1: uuid=e185888e-c7ba-4e46-905b-8ace0d0e906f
sockets: 1
vga: virtio
virtio0: media_disk01_proxmox:100/vm-100-disk-3.qcow2,iothread=1,size=32G
vmgenid: 3ffeb450-5ae6-4cd8-8508-360a8b894915

 

[leesteken]

Later I installed the Nvidia driver in the VM. The Linux Mint wizard suggested "nvidia-driver-535" and installed it successfully. Later reboot I can see the green boot logo of Linux mint, in both the real and the virtual monitors. But later the lightdm started, and the real monitor stopped sending the video and entered the power-saving mode. The virtual web monitor works fine always.
...
vga: virtio

If you set the VM Display to None (vga: none) Linux (Mint) will probably always use the GPU and display. Otherwise, you need to configure the window manager inside your Linux to use the real GPU instead of the virtual display. The last way is not specific to Proxmox but to any Linux (Mint) with two GPUs (even if one is virtual).