Comment 0 for bug 1848790

Ubuntu 19.10 arm64 on a Raspberry Pi 4 does not recognize a keyboard which works successfully on the same Raspberry Pi 4 with Ubuntu 19.10 armhf. Both USB hubs (2 and 3) were tested, without the OS seeing the keyboard on either. Booting the arm64 image on a Raspberry Pi 3, the keyboard worked successfully.

Output of lsusb under arm64 on a Pi 3:

ubuntu@ubuntu:~$ lsusb
Bus 001 Device 007: ID 413c:2106 Dell Computer Corp. Dell QuietKey Keyboard
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Output of lsusb under armhf on a Pi 4 (same keyboard attached):

ubuntu@ubuntu:~$ lsusb
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 413c:2106 Dell Computer Corp. Dell QuietKey Keyboard
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Output of lsusb under arm64 on the same Pi 4 (same keyboard attached):

ubuntu@ubuntu:~$ lsusb
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

The fact even the VIA Labs hub doesn't show up (which is built in) suggests the kernel is (for some reason) unable to enumerate anything against the USB hubs.