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, <[email protected]> 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: [email protected] [mailto: > [email protected]] On Behalf Of Peter Teoh > Sent: Saturday, September 29, 2012 7:12 AM > To: [email protected] > 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 > [email protected] > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- Regards, Peter Teoh
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