Windows Vista Forums

previously working USB devices now showing as "Unknown Device"

  1. #1


    A L Guest

    previously working USB devices now showing as "Unknown Device"

    Hello-

    All of a sudden a few days ago, many of my USB devices started showing as
    Unknown Devices in the Device Manager. I've read that this sometimes happens
    in WinXP too- but no post that I found about the problem proposed a solution
    (for Vista or XP.) If I disable the "Standard Enhanced PC to USB Host
    Controller", the system then locates drivers for all of the devices, but runs
    them in USB 1.1 (slow!) mode.

    I'm seeing this for flash storage devices (thumb drives, flash card readers,
    ipod), logitech quickcam 5000, plantronics USB headset etc. Oddly, my MS
    Intellimouse Explorer 3.0 and APC UPS work fine!

    Anyone know what to do?
    I have a ton of USB devices defined in the registry under
    HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Enum\USB\ , but regedit does not
    allow me to remove any of these.

    I also unfortunately don't have a System Restore Point to back when my USB
    devices were working.

    If anyone has ideas for something to try, please post! Thanks, Al

      My System SpecsSystem Spec

  2.   


  3. #2


    A L Guest

    RE: previously working USB devices now showing as "Unknown Device"


    I'm basically having this problem:

    http://support.microsoft.com/kb/920875

    except that the page has a hotfix for only XP and not Vista! Hmmm....




    "A L" wrote:

    > Hello-
    >
    > All of a sudden a few days ago, many of my USB devices started showing as
    > Unknown Devices in the Device Manager. I've read that this sometimes happens
    > in WinXP too- but no post that I found about the problem proposed a solution
    > (for Vista or XP.) If I disable the "Standard Enhanced PC to USB Host
    > Controller", the system then locates drivers for all of the devices, but runs
    > them in USB 1.1 (slow!) mode.
    >
    > I'm seeing this for flash storage devices (thumb drives, flash card readers,
    > ipod), logitech quickcam 5000, plantronics USB headset etc. Oddly, my MS
    > Intellimouse Explorer 3.0 and APC UPS work fine!
    >
    > Anyone know what to do?
    > I have a ton of USB devices defined in the registry under
    > HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Enum\USB\ , but regedit does not
    > allow me to remove any of these.
    >
    > I also unfortunately don't have a System Restore Point to back when my USB
    > devices were working.
    >
    > If anyone has ideas for something to try, please post! Thanks, Al


      My System SpecsSystem Spec

  4. #3


    mikeyhsd Guest

    Re: previously working USB devices now showing as "Unknown Device"

    have you tried uninstalling the ROOT HUBS, shutting down for 3-5 minutes,
    rebooting and allowing the system to find and reinstall the USB devices.



    mikeyhsd@sport.rr.com



    "A L" <AL@discussions.microsoft.com> wrote in message news:97982AB4-57B3-4165-93D3-84FFE87F6261@microsoft.com...
    Hello-

    All of a sudden a few days ago, many of my USB devices started showing as
    Unknown Devices in the Device Manager. I've read that this sometimes happens
    in WinXP too- but no post that I found about the problem proposed a solution
    (for Vista or XP.) If I disable the "Standard Enhanced PC to USB Host
    Controller", the system then locates drivers for all of the devices, but runs
    them in USB 1.1 (slow!) mode.

    I'm seeing this for flash storage devices (thumb drives, flash card readers,
    ipod), logitech quickcam 5000, plantronics USB headset etc. Oddly, my MS
    Intellimouse Explorer 3.0 and APC UPS work fine!

    Anyone know what to do?
    I have a ton of USB devices defined in the registry under
    HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Enum\USB\ , but regedit does not
    allow me to remove any of these.

    I also unfortunately don't have a System Restore Point to back when my USB
    devices were working.

    If anyone has ideas for something to try, please post! Thanks, Al

      My System SpecsSystem Spec

  5. #4


    A L Guest

    Re: previously working USB devices now showing as "Unknown Device"

    Thanks for the help. I did try uninstalling all the various USB devices in
    the Device Manager multiple times. No luck. I ended up installing a spare
    PCI USB 2 card I had and am able to connect everything through there instead
    of the ports on my motherboard. Looks like MS has a fix for this problem in
    XP:

    http://support.microsoft.com/kb/920875

    Hopefully they'll release a hotfix for Vista too. Al

    ps- I have XP installed on another partition, the motherboard USB jacks work
    fine there, so it's definitely have software issue I'm having.

    "mikeyhsd" wrote:

    > have you tried uninstalling the ROOT HUBS, shutting down for 3-5 minutes,
    > rebooting and allowing the system to find and reinstall the USB devices.
    >
    >
    >
    > mikeyhsd@sport.rr.com
    >
    >
    >
    > "A L" <AL@discussions.microsoft.com> wrote in message news:97982AB4-57B3-4165-93D3-84FFE87F6261@microsoft.com...
    > Hello-
    >
    > All of a sudden a few days ago, many of my USB devices started showing as
    > Unknown Devices in the Device Manager. I've read that this sometimes happens
    > in WinXP too- but no post that I found about the problem proposed a solution
    > (for Vista or XP.) If I disable the "Standard Enhanced PC to USB Host
    > Controller", the system then locates drivers for all of the devices, but runs
    > them in USB 1.1 (slow!) mode.
    >
    > I'm seeing this for flash storage devices (thumb drives, flash card readers,
    > ipod), logitech quickcam 5000, plantronics USB headset etc. Oddly, my MS
    > Intellimouse Explorer 3.0 and APC UPS work fine!
    >
    > Anyone know what to do?
    > I have a ton of USB devices defined in the registry under
    > HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Enum\USB\ , but regedit does not
    > allow me to remove any of these.
    >
    > I also unfortunately don't have a System Restore Point to back when my USB
    > devices were working.
    >
    > If anyone has ideas for something to try, please post! Thanks, Al


      My System SpecsSystem Spec

  6. #5


    barb Guest

    Re: previously working USB devices now showing as "Unknown Device"

    I am having the same problem - how do I get the hotfix that is mentioned?
    --
    barb


    "A L" wrote:

    > Thanks for the help. I did try uninstalling all the various USB devices in
    > the Device Manager multiple times. No luck. I ended up installing a spare
    > PCI USB 2 card I had and am able to connect everything through there instead
    > of the ports on my motherboard. Looks like MS has a fix for this problem in
    > XP:
    >
    > http://support.microsoft.com/kb/920875
    >
    > Hopefully they'll release a hotfix for Vista too. Al
    >
    > ps- I have XP installed on another partition, the motherboard USB jacks work
    > fine there, so it's definitely have software issue I'm having.
    >
    > "mikeyhsd" wrote:
    >
    > > have you tried uninstalling the ROOT HUBS, shutting down for 3-5 minutes,
    > > rebooting and allowing the system to find and reinstall the USB devices.
    > >
    > >
    > >
    > > mikeyhsd@sport.rr.com
    > >
    > >
    > >
    > > "A L" <AL@discussions.microsoft.com> wrote in message news:97982AB4-57B3-4165-93D3-84FFE87F6261@microsoft.com...
    > > Hello-
    > >
    > > All of a sudden a few days ago, many of my USB devices started showing as
    > > Unknown Devices in the Device Manager. I've read that this sometimes happens
    > > in WinXP too- but no post that I found about the problem proposed a solution
    > > (for Vista or XP.) If I disable the "Standard Enhanced PC to USB Host
    > > Controller", the system then locates drivers for all of the devices, but runs
    > > them in USB 1.1 (slow!) mode.
    > >
    > > I'm seeing this for flash storage devices (thumb drives, flash card readers,
    > > ipod), logitech quickcam 5000, plantronics USB headset etc. Oddly, my MS
    > > Intellimouse Explorer 3.0 and APC UPS work fine!
    > >
    > > Anyone know what to do?
    > > I have a ton of USB devices defined in the registry under
    > > HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Enum\USB\ , but regedit does not
    > > allow me to remove any of these.
    > >
    > > I also unfortunately don't have a System Restore Point to back when my USB
    > > devices were working.
    > >
    > > If anyone has ideas for something to try, please post! Thanks, Al


      My System SpecsSystem Spec

  7. #6


    A L Guest

    Re: previously working USB devices now showing as "Unknown Device"


    The set of patches that were released via Windows Updates the day that Vista
    became available to consumers had the patch and it fixed my problem. I don't
    remember the number unfortunately.


    "barb" wrote:

    > I am having the same problem - how do I get the hotfix that is mentioned?
    > --
    > barb
    >
    >
    > "A L" wrote:
    >
    > > Thanks for the help. I did try uninstalling all the various USB devices in
    > > the Device Manager multiple times. No luck. I ended up installing a spare
    > > PCI USB 2 card I had and am able to connect everything through there instead
    > > of the ports on my motherboard. Looks like MS has a fix for this problem in
    > > XP:
    > >
    > > http://support.microsoft.com/kb/920875
    > >
    > > Hopefully they'll release a hotfix for Vista too. Al
    > >
    > > ps- I have XP installed on another partition, the motherboard USB jacks work
    > > fine there, so it's definitely have software issue I'm having.
    > >
    > > "mikeyhsd" wrote:
    > >
    > > > have you tried uninstalling the ROOT HUBS, shutting down for 3-5 minutes,
    > > > rebooting and allowing the system to find and reinstall the USB devices.
    > > >
    > > >
    > > >
    > > > mikeyhsd@sport.rr.com
    > > >
    > > >
    > > >
    > > > "A L" <AL@discussions.microsoft.com> wrote in message news:97982AB4-57B3-4165-93D3-84FFE87F6261@microsoft.com...
    > > > Hello-
    > > >
    > > > All of a sudden a few days ago, many of my USB devices started showing as
    > > > Unknown Devices in the Device Manager. I've read that this sometimes happens
    > > > in WinXP too- but no post that I found about the problem proposed a solution
    > > > (for Vista or XP.) If I disable the "Standard Enhanced PC to USB Host
    > > > Controller", the system then locates drivers for all of the devices, but runs
    > > > them in USB 1.1 (slow!) mode.
    > > >
    > > > I'm seeing this for flash storage devices (thumb drives, flash card readers,
    > > > ipod), logitech quickcam 5000, plantronics USB headset etc. Oddly, my MS
    > > > Intellimouse Explorer 3.0 and APC UPS work fine!
    > > >
    > > > Anyone know what to do?
    > > > I have a ton of USB devices defined in the registry under
    > > > HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Enum\USB\ , but regedit does not
    > > > allow me to remove any of these.
    > > >
    > > > I also unfortunately don't have a System Restore Point to back when my USB
    > > > devices were working.
    > > >
    > > > If anyone has ideas for something to try, please post! Thanks, Al


      My System SpecsSystem Spec


previously working USB devices now showing as "Unknown Device"
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