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Thread: USB ports not working

  1. #1
    Join Date
    Apr 2014
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    16

    USB ports not working

    im booting Ubuntu 12.04 from my usb stick n everything was working great but then eventually the other 2 usb ports stopped responding when i plugged something in, yesterday both worked until i restarted ubuntu now its the same, i know nothings wrong with the ports cause i can plug my usb stick that has ubuntu into one of the other 2 turn on my laptop n it boots up fine but the other 2 usb ports that arent being used arent working even if i have something plugged in them before turning my laptop on, any ideas?

  2. #2
    Join Date
    Sep 2013
    Location
    Newcastle NE (England)
    Beans
    200
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: USB ports not working

    Try the following commands to see what output you get. gksudo lshw | less and lsusb with at least 1 usb device connected.
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  3. #3
    Join Date
    Apr 2014
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    16

    Re: USB ports not working

    Quote Originally Posted by david98 View Post
    Try the following commands to see what output you get. gksudo lshw | less and lsusb with at least 1 usb device connected.
    only shows the 1 connected with Ubuntu on it, shows nothin for the other one i had connected

  4. #4
    Join Date
    Oct 2009
    Location
    Reykjavík, Ísland
    Beans
    9,476
    Distro
    Lubuntu 14.04 Trusty Tahr

    Re: USB ports not working

    How does a live boot of 14.04 work?
    About problems due to upgrading
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    Please visit Quick Links -> Unanswered Posts

  5. #5
    Join Date
    Nov 2008
    Location
    Kingdom of cookies
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    Hidden!
    Distro
    Ubuntu Development Release

    Re: USB ports not working

    Moved to Absolute Beginners Section
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  6. #6
    Join Date
    Apr 2014
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    16

    Re: USB ports not working

    Quote Originally Posted by mörgæs View Post
    How does a live boot of 14.04 work?
    r u asking if the usb ports work in 14.04? i tried n no they're still refusing to work for some reason, by some miracle a few days ago they worked, then i restart n nothing

  7. #7
    Join Date
    Oct 2007
    Beans
    1,756

    Re: USB ports not working

    Try disabling the usb2 module:

    Code:
    sudo rmmod ehci-hcd
    Then, plug your usb in, count to 15, and do:

    Code:
    dmesg | tail
    and post the output

  8. #8
    Join Date
    Apr 2014
    Beans
    16

    Re: USB ports not working

    Quote Originally Posted by llamabr View Post
    Try disabling the usb2 module:

    Code:
    sudo rmmod ehci-hcd
    Then, plug your usb in, count to 15, and do:

    Code:
    dmesg | tail
    and post the output
    for the sudo rmmod ehci-hcd it said "ERROR: Module ehci_hcd does not exist in /proc/modules"

  9. #9
    Join Date
    Apr 2014
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    12

    Re: USB ports not working

    @llamabr: You cannot disable the USB modules when using the latest kernels, because they are now built-in.

  10. #10
    Join Date
    Oct 2007
    Beans
    1,756

    Re: USB ports not working

    Quote Originally Posted by geral-k View Post
    @llamabr: You cannot disable the USB modules when using the latest kernels, because they are now built-in.
    Thanks, Ubuntu, for dumbing down something I love a little bit more.

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