I did an update on my asus Tuf x570 Gaming pro motherboard and I had the same issues with it booting into UEFI and not being able to do any passthrough on VM and getting the vfio_region_write failed: Device or resource busy.
After going back and making sure the flash drive booted in legacy mode, everything worked (I did not have to edit Syslinux Configuration or anything)
[6.9.1] Issues with GPU passthrough
in Stable Releases
Posted
I wanted to say thank you to JSaul!
I did an update on my asus Tuf x570 Gaming pro motherboard and I had the same issues with it booting into UEFI and not being able to do any passthrough on VM and getting the vfio_region_write failed: Device or resource busy.
After going back and making sure the flash drive booted in legacy mode, everything worked (I did not have to edit Syslinux Configuration or anything)
Thank you!