@olivierlambert yes I'm getting this

[    5.091321] NVRM: loading NVIDIA UNIX x86_64 Kernel Module  470.82.00  Thu Oct 14 10:24:40 UTC 2021
[   46.870183] NVRM: GPU 0000:00:05.0: RmInitAdapter failed! (0x22:0x56:667)
[   46.870225] NVRM: GPU 0000:00:05.0: rm_init_adapter failed, device minor number 0
[   46.877175] NVRM: GPU 0000:00:05.0: RmInitAdapter failed! (0x22:0x56:667)
[   46.877214] NVRM: GPU 0000:00:05.0: rm_init_adapter failed, device minor number 0
[   53.426603] NVRM: GPU 0000:00:05.0: RmInitAdapter failed! (0x22:0x56:667)
[   53.426701] NVRM: GPU 0000:00:05.0: rm_init_adapter failed, device minor number 0
[   53.433752] NVRM: GPU 0000:00:05.0: RmInitAdapter failed! (0x22:0x56:667)
[   53.433830] NVRM: GPU 0000:00:05.0: rm_init_adapter failed, device minor number 0
[  412.663599] NVRM: GPU 0000:00:05.0: RmInitAdapter failed! (0x22:0x56:667)
[  412.663716] NVRM: GPU 0000:00:05.0: rm_init_adapter failed, device minor number 0
[  412.671452] NVRM: GPU 0000:00:05.0: RmInitAdapter failed! (0x22:0x56:667)
[  412.671554] NVRM: GPU 0000:00:05.0: rm_init_adapter failed, device minor number 0

I'm having the exact same problem on my R630 with a E5-2620V3. Tested on Ubuntu 20.04. Tried using the latest drivers (470) as well as the future build (495) with the same results of no device being found when running nvidia-smi. Card has been confirmed working on a baremetal windows machine as well as inside a proxmox VM. Happy to do anything needed to help get this figured out.