On Wed, Feb 19, 2014 at 04:45:57PM +0800, Lu, Baolu wrote: > Thanks for reply and help. I attached an Ajays NET20DC to the USB port. What is that device? Is it a EHCI debug device? Are you sure you plugged the correct end in? (The devices I have don't say which way they go, and I always reverse them, which keeps them from working...) > It seems not help here. > > Below is the dmesg and lsusb output. > > [root@localhost ~]# uname -a > Linux localhost.localdomain 3.12.8 #2 SMP Tue Feb 18 06:09:46 CST 2014 > x86_64 x86_64 x86_64 GNU/Linux > > [root@localhost ~]# lsusb -t > /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M > |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M > |__ Port 2: Dev 3, If 0, Class=Vendor Specific Class, > Driver=usb_debug, 480M > |__ Port 4: Dev 4, If 0, Class=Human Interface Device, > Driver=usbhid, 12M > |__ Port 4: Dev 4, If 1, Class=Human Interface Device, > Driver=usbhid, 12M > |__ Port 7: Dev 5, If 0, Class=Human Interface Device, > Driver=usbhid, 1.5M > |__ Port 7: Dev 5, If 1, Class=Human Interface Device, > Driver=usbhid, 1.5M > /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M > |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M > |__ Port 4: Dev 3, If 0, Class=Vendor Specific Class, > Driver=usb_debug, 480M That's the wrong end, the "client" side, not the "debug" side. Try reversing it and see if that works. greg k-h -- 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
