3、 打开设备管理器，展开通用串行总线控制器，检查USB Root Hub是否存在。如果驱动被卸载，可能是误删了USB Root Hub所致。 4、 如果没有USB Root Hub，我们点击设备管理器顶部的操作，所示。 5、 在展开的选项里，选择扫描检测硬件改动，即可重新下载USB Root Hu。

You may notice USB devices may stop functioning correctly when multiple devices connected to the same USB hub go into selective suspend. In this post, we will identify the root cause of the issue, as ...

The problem might be with your USB device or USB port. To check this, connect the USB device to another USB port and see what happens. You can also connect another ...

While I think it’s fair to say that USB devices are generally easier to configure and less prone to problems than their serial- and parallel-based ancestors, problems can still occur. When USB devices ...

I have a 27" iMac and I am confused by the seemingly strange arrangement of root ports. The chipset in the machine has a whopping 14 root ports, but Apple chose to only make use of two root ports. One ...