The USB hard drive that is on the other USB bus does not connect to my computer. Nor does anything else connected to that bus. But a keyboard connected to that bus works during boot up.

$ lsusb
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 003: ID 04f2:0402 Chicony Electronics Co., Ltd Genius LuxeMate i200 Keyboard
Bus 005 Device 002: ID 192f:0916 Avago Technologies, Pte. ADNS-2710 Optical Mouse Controller
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID 0b05:18f3 ASUSTek Computer, Inc. AURA LED Controller
Bus 003 Device 002: ID 8087:0025 Intel Corp. Wireless-AC 9260 Bluetooth Adapter
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 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I think there is an issue with the USB3 driver.