最初は変だったが電源offしたら直った。どういうリソース割当てなのか不明。
~% dmesg | grep -i uhci uhci0: <VIA 83C572 USB controller> port 0xd400-0xd41f irq 11 at device 7.2 on pci0 usb0: <VIA 83C572 USB controller> on uhci0 uhub0: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1 uhci1: <VIA 83C572 USB controller> port 0xd800-0xd81f irq 11 at device 7.3 on pci0 usb1: <VIA 83C572 USB controller> on uhci1 uhub1: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1 uhci2: <VIA 83C572 USB controller> port 0xe400-0xe41f irq 7 at device 15.0 on pci0 usb2: <VIA 83C572 USB controller> on uhci2 uhub2: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1 uhci3: <VIA 83C572 USB controller> port 0xe800-0xe81f irq 11 at device 15.1 on pci0 usb3: <VIA 83C572 USB controller> on uhci3 uhub3: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1