My Motherboard/BIOS doesn't detect USB devices (Mouse, Keyboard) when I cold boot my computer (booting after complete shutdown). BIOS is always showing me 0 Keyboard / 0 Mouse / 2 USB Hosts connected. If I press the reset button at that point, my computer reboots and BIOS will recognize all devices. Fastboot is OFF.
This means that I have to press the reset button on my computer after every cold boot. I can't figure out what's causing this
- If I don't press the reset button during first boot and let my PC continue to boot with 0 Mouse / 0 Keyboard detected, they will NOT be detected by the operating system either (Ubuntu, Windows 10, Hackintosh).
- BIOS recognizes that 2 USB Hosts are connected (front panel USB Ports on my Case)
- The LEDs of my Keyboard and Mouse stay off when they are not detected by BIOS (they don't get any power at all).
- The problem persists regardless of which Keyboard, Mouse or USB Port I use (Apple Keyboard, WASD Keyboard, Corsair K65 Keyboard, Logitech MX 518 & G502 Mouse)
I'm using the following BIOS Settings potentially relevant to USB:
-
Fastboot: Disabled
-
POST Report: 5 Sec
- Boot up NumLock State: Enabled
- Interrupt 19 Capture
- Legacy USB Support: AUTO
- Intel xHCI Mode: Smart Auto
- EHCI Hand-off: Disabled
- Launch CSM: Enabled
- Boot device control: UEFI and Legacy OPROM
- Boot from storage devices: Legacy OPROM first
Hardware:
Asus Maximus VII Hero (Z97, BIOS Version 3201 x64), Intel 4790K, 32GB RAM, GTX 1080
Best Answer
OK I think I've found a solution following Tonnys comment. Hopefully this will help someone with the same issue. Read carefully so you don't have to reset your CMOS like I had to.
EHCI Hand-off
toEnabled
,Legacy USB Support
fromAuto
toEnabled
.I left
Legacy USB Support
set toAuto
first, which caused my Motherboard to not detect USB Devices during boot AT ALL (not even after reset) and I was locked out of BIOS completely. I guessAuto
doesn't work as it should. I had to clear my CMOS in order to be able to get back into BIOS.