And, I see that usb1-7 is a Synaptics device, i.e. likely relevant with a built-in touchpad or such, which can't be disconnected. That may explain. As a blind shot, could you try to remove once the file /usr/lib/udev/rules.d/69-libmtp.rules ? Maybe better to move somewhere else to save for restoring later. You might need to create initrd again (just run mkinitrd).