This steps helped me when I had same problem in SUSE9. The Reason is "/proc/bus/usb/ doesn't has any entry where actually lsusb searches to show USB BUS devices.To make that happen you have to manually . Mount the Bus devices using below command. mount -t usbdevfs none /proc/bus/usb/ And you are done. Now lsusb should show all USB BUS devies. Thanks Ashish Bunkar -----Original Message----- From: kernelnewbies-bounces@kernelnewbies.org [mailto:kernelnewbies-bounces@kernelnewbies.org] On Behalf Of Peter Teoh Sent: Saturday, September 29, 2012 7:12 AM To: kernelnewbies@kernelnewbies.org Subject: Why "lsusb" return nothing? I entered "lsusb" at the command line (as root) and nothing is return, not even any error message. Doing a strace the last few lines are: open("/dev/bus/usb", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/proc/bus/usb", O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = -1 ENOENT (No such file or directory) What happened? This is Ubuntu 10.04 (it used NOT to be like that, not sure I what did wrong last time). But running a VirtualBox INSIDE this same OS, I was able to get result from "lsusb" (after enabling the USB devices in VirtualBox interface) and strace gives result: open("/dev/bus/usb/001/002", O_RDWR) = 3 ioctl(3, USBDEVFS_IOCTL, 0xbff6f75c) = -1 ENOTTY (Inappropriate ioctl for device) close(3) = 0 open("/dev/bus/usb/001/001", O_RDWR) = 3 Why the difference? -- Regards, Peter Teoh _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies