Results 1 to 3 of 3

Thread: USB bug?

  1. #1
    Join Date
    Aug 2013
    Beans
    60

    USB bug?

    Hi all,

    I issued "lsusb" the other day, trying to get information about my laptop's internal wireless internet adapter. I noticed this particular peculiarity in the feedback and thought it would be worth asking about:

    Code:
    andy@ZoostormLinuxLaptop:~$ lsusb
    Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
    Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
    Bus 003 Device 004: ID 0bb4:0fb4 HTC (High Tech Computer Corp.) 
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
    Bus 002 Device 003: ID 0bda:8723 Realtek Semiconductor Corp.
    For some reason, there seems to be three 2.0 root hubs - the odd thing, however, is that this does not in anyway match up to my USB ports (which it should, right?). I've only three USB ports, 2xUSB3.0 and 1xUSB2.0. Can anyone explain this feedback based on that - I suspect it's something about the kernel or lsusb I don't understand.

    Finally, a quick shout out to my wireless thread, which needs solving ASAP . Further info can be found here

  2. #2
    Join Date
    Mar 2010
    Location
    India
    Beans
    8,178
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: USB bug?

    Quote Originally Posted by Andrew_Lucas View Post
    For some reason, there seems to be three 2.0 root hubs - the odd thing, however, is that this does not in anyway match up to my USB ports (which it should, right?). I've only three USB ports, 2xUSB3.0 and 1xUSB2.0.
    My laptop has four internal USB hubs (3xUSB2, 1xUSB3), and only two external USB ports (1xUSB2, 1xUSB3).

    Some of the internal hubs are used for internal devices like webcam, bluetooth, fingerprint reader, (sometimes) wifi adapters, card readers etc. So don't get confused with that. The command lsusb doesn't lie, although you may get the details of 'what' the other hubs are used for only when the devices attached to them are in use.

    To get these details, the most common commands are "usb-devices" and "lsusb -v"

    Hope it helps explaining the lsusb outputs.

    PS:
    Posted on your other thread.
    Varun
    Help others by marking threads as [SOLVED], if they are. (See how)
    Wireless Script | Use Code Tags
    Am I not replying you? Perhaps this is why.

  3. #3
    Join Date
    Aug 2013
    Beans
    60

    Re: USB bug?

    Quote Originally Posted by varunendra View Post
    My laptop has four internal USB hubs (3xUSB2, 1xUSB3), and only two external USB ports (1xUSB2, 1xUSB3).

    Some of the internal hubs are used for internal devices like webcam, bluetooth, fingerprint reader, (sometimes) wifi adapters, card readers etc. So don't get confused with that. The command lsusb doesn't lie, although you may get the details of 'what' the other hubs are used for only when the devices attached to them are in use.

    To get these details, the most common commands are "usb-devices" and "lsusb -v"

    Hope it helps explaining the lsusb outputs.

    PS:
    Posted on your other thread.
    Cheers man. That's really cleared things up!

    Your ongoing support is appreciated in the wirless thread, too.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •