Without other usb devices the keyboard works immediately. With them it takes 5 ish seconds for it to start responding. This is regardless of which device is discovered first (which I can manipulate), it seems to just wait for all of them. Is there a way to make it not do that?
Edit: This is specifically about linux boot. It otherwise works fine in bios / bootloader
Was there no option about it on the BIOS/UEFI about something like that?
There are lots of BIOS options that impact USB devices, and especially input devices. I’d start digging. If anything, I’d try plugging into the USB ports that are connected to the main bridge at the top of the board, and not any that are extended via passthrough cable. On some boards, those USB ports are set to emulate PS2 serial.
I believe this is a hardware issue. Have you checked the USB options in the BIOS?
I had an issue where one keyboard (worked with another one) worked in bootloader, but not when entering the encryption password after that. I believe I solved that by moving keyboard earlier in the module list in mkinitcpio.conf. Maybe something similar would solve your issue?
Hint: try another USB port.
USB is like a network, and it could be a jungle of cables and ports and switches and bridges and whatnot. But the closer you get to the mainboard, the better are your chances to escape such a problem.
Check if you find anything about this in the kernel log (dmesg).
