If you do not use any USB 2.0 devices on the computer, another workaround is to turn off the USB 2.0 controller in Device Manager. After you turn off the USB 2.0 controller, the problem that is described earlier in this article with USB 1.x devices does not occur.
- If you try to use a USB 1.x storage device immediately after you resume your computer, the problem may still occur. However, the problem does not occur if you then try to use the storage device again in a few seconds.
- Soon after you resume your computer, you may receive an "Unsafe Removal of Device" message that mentions the USB 1.x device. You can safely close this box. This message occurs because of a Windows 2000 timing issue that involves powering up both the USB companion controller driver stack and the Enhanced Host Controller interface (EHCI) stack after resuming from suspend.
If the companion controller root hub driver powers up first, the USB 1.x devices that were attached to the root hub ports when the computer entered suspend are no longer attached. Therefore, the driver informs Plug and Play that the device has been removed. This occurs because the devices were routed to the EHCI controller when the Configure Flag was set, but they are not currently attached to the companion controller.
When the EHCI controller (for USB 2.0) root hub driver then powers up later, the root hub ports are reset and USB 1.x devices are routed back to the companion controllers. The companion controller hub then enumerates the devices again. They are then detected and become functional.
This does not affect USB 2.0 devices because they always remain attached to the EHCI controller.
ID articol: 323754 - Ultima examinare: 19 iun. 2014 - Revizie: 1