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ITsVISTA KB-Link: KB2521680

All USB Downstream ports are disabled on a EHCI Host Controller after restart or inserting a USB device on Windows Vista or Windows 7

When restarting Windows or when inserting/unplugging a USB 2.0 device to an Enhanced Host Controller where there are other USB 2.0 devices attached, you may encounter the following symptoms:

  • Some USB ports are disabled and as a result, USB 2.0 devices attached to these ports appear with a Yellow Exclamation in device manager.

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2521680.

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