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@xxxxxxxx> 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@xxxxxxxxxxxxxxxxx [mailto:kernelnewbies-bounces@xxxxxxxxxxxxxxxxx] On Behalf Of Peter Teoh
Sent: Saturday, September 29, 2012 7:12 AM
To: kernelnewbies@xxxxxxxxxxxxxxxxx
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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