I have your X8DTH-iF motherboard and it works great, but i cannot get the IPMI KVM over LAN Remote Console to work. The screen displays, and the remote video display works fine, but the USB keyboard input does not ever work at all. I would not expect this problem is a HW problem, but if you think that it is, I suppose might need to RMA the motherboard and get a replacement so the IPMI KVM Remote Viewer keyboard input can work.
I don’t believe is hardware IPMI issue, I believe issue maybe limitation to access. Make sure all USB ports enable by default inside the BIOS setting.