I have a Kinesis Advantage MPC/USB keyboard plugged into my Z77 Extreme6. When I power on my computer, I am unable to use the keyboard until the kernel does its hardware detection. This happens regardless of what I have set for the "Legacy USB Support" setting in BIOS, and regardless of which USB port the keyboard is plugged into.
- I have a USB mouse that works fine when "Legacy USB Support" is set to anything except "Disabled".
- The keyboard has a built-in unpowered USB hub. The System Browser in BIOS shows this hub in the port where I have the keyboard plugged in, and this is updated correctly as I move the keyboard from one USB port to another. However, my USB mouse is similarly unusable when plugged into the keyboard's USB hub.
- During POST, while my USB keyboard is plugged in, I see Dr. Debug report status D7 (No Console Input Devices are found). If I unplug and replug the keyboard, I see status B4 (USB hot plug), but I'm still not able to use the keyboard.
- My BIOS version is 1.90.
- Keyboard worked fine with legacy USB support in my previous motherboard (Gigabyte GA-P55A-UD3)
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