*Update*: By updating BIOS from 1602 to 1802 I wasn't able to boot anymore at all because of the 'No keyboard connected' message. That's why I had to dig deeper into this. I found out that it's not caused by the USB hub I listed below ('TP-Link UH700') but by one of my monitors (DELL U2518D) usb hubs connected to it. After disconnecting my monitors usb I am able to boot successfully 100% of the time.
The overall problem: When connected over my usb hub, bios gets all weird and does not properly recognize my keyboard.
Workaround: Connect the keyboard directly to the mainboard. (Will still show the â€˜no keyboard connectedâ€™ message in 1 of 5 boots)
What happens if I connect the keyboard over the usb hub to any of the mainboards usb ports:
BIOS cannot find any keyboard, does not allow me to get into setup or type in my windows disk encryption key
When connecting another keyboard to any usb port on the mainboard, I can get into the BIOS and use it to type in my windows disk encryption key (But when I am inside windows, it doesnâ€™t recognise my usb hub at all, not even connecting and disconnecting helps.)
What happens if I connect the keyboard directly to the mainboard (any port):
Keyboard can be used in BIOS, bootloader, everywhere
When booting into windows, the usb hub is correctly recognized and any devices connected to it work flawlessly
I tried all USB settings that are available in my bios version, without success (Legacy USB Support Enabled/Disabled, XHCI Hand-Off Enabled/Disabled).
To me it looks like the BIOS is having issues with keyboards connected over USB 3.0 hubs (maybe only self-powered?). Is there any hope for this issue to get resolved or is there anything I could do?