On Tue, 21 Apr 2015, Tom Yan wrote: > Thank you very much for your reply. > > So I tried to see if there's any difference between the two devices. I > can see that the one didn't get enabled by default has an extra > interface with 0 for the two attributes. But does that matter? Because > if it does, shouldn't the mouse interface prevents the other one to > get enabled by default as well? No, it doesn't matter. > Seems to me the keyboard interface is the first interface for both devices: > [tom@localhost ~]$ cat > /sys/devices/pci0000\:00/0000\:00\:14.0/usb3/3-13/3-13\:1.0/bInterfaceSubClass > 01 > [tom@localhost ~]$ cat > /sys/devices/pci0000\:00/0000\:00\:14.0/usb3/3-13/3-13\:1.0/bInterfaceProtocol > 01 > [tom@localhost ~]$ cat > /sys/devices/pci0000\:00/0000\:00\:14.0/usb3/3-14/3-14\:1.0/bInterfaceSubClass > 01 > [tom@localhost ~]$ cat > /sys/devices/pci0000\:00/0000\:00\:14.0/usb3/3-14/3-14\:1.0/bInterfaceProtocol > 01 > > [tom@localhost ~]$ diff <(sudo lsusb -v -s 003:002) <(sudo lsusb -v -s 003:003) > can't get device qualifier: Resource temporarily unavailable > can't get debug descriptor: Resource temporarily unavailable > can't get device qualifier: Resource temporarily unavailable > can't get debug descriptor: Resource temporarily unavailable It's a little difficult to tell what's going on just from the diff. Can you post the complete lsusb -v output for both devices? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
