Why "lsusb" return nothing?

[Ashish_Bunkar at Dell.com]

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 at kernelnewbies.org [mailto:kernelnewbies-bounces at kernelnewbies.org] On Behalf Of Peter Teoh
Sent: Saturday, September 29, 2012 7:12 AM
To: kernelnewbies at 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

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