I thought this was fixed on the recent revisions of the MPx chipset. I just got a Tyan Tiger MPx and it didn't come with an addin USB card which further led me to believe that the problem was fixed. Also the most recent BIOS revision adds support for booting off of USB. Despite this the onboard USB controller appears to be detected as some nonstandard USB device and none of the USB devices I plug in seem to work. My USB keyboard doesn't work at all during the boot process if I enable legacy support in the BIOS, so I don't think it's a driver issue in Windows. Does anyone have a Tiger MPx with working onboard USB? Getting an addin card isn't that big a deal, but if I do, I can't use the front accessible ports on my case without some jury-riggin, which I'd like to avoid.
