USB 20cv may make USB mouse/keyboard unavailable.

I recently helped others perform USB compatibility tests.

We know that the corresponding software is usb20cv, which can be downloaded from the USB Official Website:

Usb20cv r1.4.5.0

Http://www.usb.org/developers/tools/

Note that when you run the USB 2.0 CV software, a dialog box is displayed, prompting you to switch the stack before enteringProgram.

However, it is often found that USB mouse, keyboard and other devices cannot be used at this time, so the software cannot be operated with a USB mouse.

The cause is that the software will switch the USB stack. As a result, the USB stack is not the original and cannot support the mouse, keyboard, and other USB devices.

The specific solution is to change the keyboard or mouse of the PS/2 interface, restart the machine, log on to the system with the PS/2 keyboard, and re-run the software, then shut down the software. At this time, the software will switch the USB stack to the original system. At this time, the USB keyboard, mouse and other devices can work normally.

Simply put,Connect to a PS/2 keyboard, restart the machine, re-run the software, and then shut down. Then, the USB device can work normally..