Try to reinstall Lenovo's power management software and Lenovo's desktop navigation driver first. In addition, Lenovo software is a bit rubbish, sometimes it suddenly fails, which I often encounter, and it will usually be normal after restarting. Finally, there is a friend's problem on the machine. Use the reg registry file of "Disable the touchpad after inserting an external mouse". When this option is turned on in the trackpad control, it will conflict with Lenovo's software and the touch button cannot be used. Turn off this option and it will be OK.