Long time user here, and i'm currently working on migrating from a dell T5500 to a hp z840.
Things went downhill from what I thought should be a fairly easy switch. I have some VM's that utilize the pci passthrough and i went to configure them, but the IOMMU groups did not exist. I checked the cpu and it supports vt-d. I checked bios settings and it shows vt-d as enabled. I did attempt to search around to find some info on here, but those items seemed to be what fixed most users issues.
I migrated back, and i'm putting together a quick test build so I can get some logs. If anyone can offer some advice, I'd appreciate it! Thank you!