Why "lsusb" return nothing?

[Peter Teoh]

THank you for your help.   This is the result:

mount -t usbdevfs none /proc/bus/usb
mount: mount point /proc/bus/usb does not exist

mkdir /proc/bus/usb
mkdir: cannot create directory `/proc/bus/usb': No such file or directory

And supposed I tried a directory that exist:

mount -t usbdevfs none /proc/bus
mount: unknown filesystem type 'usbdevfs'

The exact mirror (before the problem start I mirrored the system) is still
working today, and I have not find any difference between the two version
so far.

On Mon, Oct 1, 2012 at 12:51 PM, <Ashish_Bunkar at dell.com> wrote:

> 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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>



-- 
Regards,
Peter Teoh
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