previously working USB devices now showing as "Unknown Device"

Posted: 01-08-2007, 04:31 AM

A L

Guest
Posts: n/a

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

Responses to "previously working USB devices now showing as "Unknown Device""

A L

Guest
Posts: n/a

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

Posted: 01-08-2007, 04:57 AM

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

mikeyhsd

Guest
Posts: n/a

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

Posted: 01-08-2007, 01:56 PM

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

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