ASUS P9D-E/4L + RX 6700 XT prevents Proxmox from booting (black screen / blinking cursor)

[Tomblarom]

I’ve now tried several times to install my AMD RX 6700 XT in my Proxmox server. Unfortunately, without success. Whenever the card is installed, Proxmox stops booting (freezed ASUS-Bootlogo or simply a black screen). In this state I can hit Ctrl+Alt+Del to reboot the machine. At first, I suspected an incorrect BIOS setting or that Proxmox was booting in Legacy BIOS mode. I also removed the riser card and installed the card directly. I also tired temporarily removing the QNAP QM2-2P-384A. I now suspect that it is due to an incompatibility between the card and the motherboard.
Could that actually be the case?

Hardware:

• ASUS P9D-E/4L
• Xeon E3-1231 v3
• Samsung 850 Pro 256 GB SATA SSD (Proxmox boot)
• ASUS PIKE 2308
• QNAP QM2-2P-384A
• ASMB7-iKVM
• RX 6700 XT

I disabled all PCIe Option ROMs and ASPM. It doesn't matter to what Above 4G Decoding and VGA 64-bit Decoding are set to. I tested both legacy and UEFI-related boot settings. Without the GPU it boots perfectly fine! With the GPU installed, it never finishes booting, as described earlier.

When the GPU is installed, new entries AMD Graphic Driver Health and Driver Health (NAVI22: Healthy) show up under Advanced in my BIOS.

Has anyone used a similar setup successfully?

 

[Tomblarom]

I'm really sorry to "push" the thread, but I'm really in the urge to solve this.

 

[MarkusKo]

It's possible that this combination of Mainboard/CPU (from 2014) and this GPU (from 2021) won't work together.

I assume this GPU does not support legacy BIOS / CSM boot anymore, so you should use UEFI boot.

What you can try:
- remove ALL expansion cards, except GPU
- test the GPU with different slots, according to the docs Slot 6 would support PCIe3 x16 if you don't use Slot 5 at the same time
- try to boot different live linux distros to test if it's a hardware compatibility issue or if it's a problem specific to proxmox ve
- enable option rom for the slot the GPU is installed, maybe something is shown there?
- power supply? this gpu needs 1x8-Pin + 1x6-Pin (at least 230W)
- only needed for nvidia GPU's but you could try to boot with "nomodeset"
- if nothing works, reset bios settings to factory, test setting one by one

Did you test the newest available version of PVE?

 

[celemine1gig]

Your board has BMC video output capability. How did you configure the corresponding jumper (VGA_SW1) on the board?
Where did you connect the cable to the actual phyiscal display? Aspeed (BMC) video output or the AMD card?