previously working USB devices now showing as "Unknown Device"


G

Guest

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
 
Ad

Advertisements

M

mikeyhsd

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.



(e-mail address removed)



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
 
Ad

Advertisements

G

Guest

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.
 

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Top