Why "lsusb" return nothing?

[Peter Teoh]

On Sat, Sep 29, 2012 at 1:12 PM, Mark Bishop <mark at bish.net> wrote:
> What does 'find /dev/ | grep dev' show
>

http://pastebin.com/tuh7fv3v

any idea?
>
> 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.
>>
>>
>>
>
> --
> Sent from my Android phone with K-9 Mail. Please excuse my brevity.



-- 
Regards,
Peter Teoh