Hey guys.
I`m here to help you about the vt-d problem on the asus rampage v edition 10 motherboar, and this problem could be present on others motherboards too.
I triple checked the configurations on the bios, sometimes the vt-d worked normally, after shutdown computer and power on again the vt-d was not worked anymore.
So I tried to reset bios to defaults. No worked.
Tried to reflash bios with downloaded bios.cap file rom website, not worked.
I discovered that I have to export bios.cap file to bios.rom with specific program. After that I can flash the bios with an external programming tool, mine is TL866.
I made this on the 2 bios chips present on the mortherboard.
When I could enter on the bios setup screen, I enabled these options:
1- ADVANCED - CPU CONFIGURATION - Intel Virtualization Technology
2- ADVANCED - System Agent Configuration - Intel VT for Directed i/o (vt-d) - Intel VT for Directed i/o
Works perfectly!
My processor is I7 6850K with 16gb ram 3200 mhz. My windows is Windows 10 2101H build.
My opinion is a bios corrupted after a lot of bios upgrades with the tool presented inside the bios screen: the ez-flash. Maybe some garbage was left during the upgrade.... I don't know for shure...
Cheers.