Why "lsusb" return nothing?

[Mark Bishop]

What does 'find /dev/ | grep dev' show

Peter Teoh <htmldeveloper at gmail.com> wrote:

>what are the implication (or symptoms) of that statement?   how do i
>know that?
>
>>ps -ef |grep usb
>root       232     2  0 07:44 ?        00:00:18 [usb-storage]
>root       266     2  0 07:44 ?        00:00:14 [usb-storage]
>root      6757     2  0 13:05 ?        00:00:00 [usb-storage]
>root      6831  5920  0 13:05 pts/0    00:00:00 grep --color=auto usb
>
>>lsmod |grep usb
>usbhid                 39214  0
>hid                    89444  1 usbhid
>usb_storage            49986  4
>
>right now, i have no problem in accessing any USB devices.   when i
>mirror the internal partition into an external USB storage disk, the
>external USB storage partition successfully the exact identical OS -
>with exactly the same sympton:   "lsusb" returning nothing.
>
>it used to be working, and there is completely no change in the kernel
>or module, as far as i am aware.   and "working" means "lsusb" used to
>return everything.
>
>On Sat, Sep 29, 2012 at 10:21 AM, Mark Bishop <mark at bish.net> wrote:
>> You don't have the USB module loaded or it isn't compiled into your
>kernel.
>>
>> Peter Teoh <htmldeveloper at gmail.com> wrote:
>>>
>>> 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 at kernelnewbies.org
>>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>>
>>
>> --
>> Sent from my Android phone with K-9 Mail. Please excuse my brevity.
>
>
>
>-- 
>Regards,
>Peter Teoh

-- 
Sent from my Android phone with K-9 Mail. Please excuse my brevity.
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