On Sat, Jan 08, 2022 at 06:19:27PM -0800, Randy Dunlap wrote: > > > On 1/8/22 16:21, James wrote: > > > > $ lsusb -tv > > /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M > > ID 1d6b:0002 Linux Foundation 2.0 root hub > > |__ Port 1: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M > > ID 04d9:1503 Holtek Semiconductor, Inc. Keyboard > > Interface 0 is the control interface, for setup/config/etc commands. Or possibly it is the boot interface, for use by the BIOS before the operating system is running. > > |__ Port 1: Dev 5, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M > > ID 04d9:1503 Holtek Semiconductor, Inc. Keyboard > > Interfaces 1..N are for function data transfer. > > > > > I tried my other computer and all the devices seem to have 2 interfaces. Not all of them. Device 4 on port 7 has only one interface. > > lsusb -tv > > /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 10000M > > ID 1d6b:0003 Linux Foundation 3.0 root hub > > /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M > > ID 1d6b:0002 Linux Foundation 2.0 root hub > > |__ Port 4: Dev 9, If 1, Class=Human Interface Device, Driver=usbhid, 12M > > ID 25a7:fa61 Areson Technology Corp Elecom Co., Ltd MR-K013 Multicard Reader > > |__ Port 4: Dev 9, If 0, Class=Human Interface Device, Driver=usbhid, 12M > > ID 25a7:fa61 Areson Technology Corp Elecom Co., Ltd MR-K013 Multicard Reader > > |__ Port 5: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M > > ID 0408:a061 Quanta Computer, Inc. > > |__ Port 5: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M > > ID 0408:a061 Quanta Computer, Inc. > > |__ Port 7: Dev 4, If 0, Class=Vendor Specific Class, Driver=, 12M > > ID 04f3:0c03 Elan Microelectronics Corp. > > |__ Port 10: Dev 5, If 0, Class=Wireless, Driver=btusb, 12M > > ID 8087:0026 Intel Corp. > > |__ Port 10: Dev 5, If 1, Class=Wireless, Driver=btusb, 12M > > ID 8087:0026 Intel Corp. > > > > -- > ~Randy Alan Stern
