I recently upgraded my cpu and motherboard. I upgraded to a AMD B550 chipset. I plugged my LFS partition and now the keyboard no longer works. I am using systemd. It works in Windows and Ubuntu, but not my home grown LFS build. I'm not using a display manager, e.g., GDM. I just go to the prompt. The keyboard works in GRUB, but when systemd starts the keyboard freezes. Even the 'scroll lock' and the 'num lock' won't light up. JournalD gives the following lines in my logs. The red line about 'ID_SEAT' affects other services as well. The mouse probably doesn't work either. It gets the same log output. But, I can't find out since all I can do is hit the reset button. Anyone ever seen these lines before? I figured it was a misconfigured systemd unit or I'm missing a udev rule.

kernel: usb 3-2: new low-speed USB device number 14 using xhci_hcd
kernel: usb 3-2: New USB device found, idVendor=046d, idProduct=c31c, bcdDevice=64.00
kernel: usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
kernel: usb 3-2: Product: USB Keyboard
kernel: usb 3-2: Manufacturer: Logitech
mtp-probe[388]: checking bus 3, device 14: "/sys/devices/pci0000:00/0000:00:08.1/0000:0a:00.3/usb3/3-2"
mtp-probe[388]: bus: 3, device: 14 was not an MTP device
systemd-udevd[387]: 3-2: /usr/lib/udev/rules.d/73-seat-late.rules:13 Failed to import properties 'ID_SEAT' from parent: Operation not permitted
systemd-udevd[387]: 3-2: Failed to process device, ignoring: Operation not permitted

IDK

but check "xhci_hcd" (intel) is the right USB for your board

there are (at least) two USB drivers for linux. i always compile them as module load them after boot if i am not booting from usb

reason is if both (or the wrong one) is loaded thing jam

"they don't agree on standards they are competing" ~ the consumer bears the brunt