The solution to the failure of the ThinkPad external PS/2 mouse wheel is as follows:
After entering the BIOS, select conifg --> Keyboard/Mouse --> Set TrackPoint to Automatic or Disabled (previously it was Enables ).
ThinkPad, the Chinese name is "thinking book", in Before 2005, it was a portable computer brand under the IBM PC Division. It enjoyed a high reputation in the industry for its ruggedness and reliability. After Lenovo acquired the IBM PC Division, the ThinkPad trademark was owned by Lenovo. Since its inception, ThinkPad has maintained a classic black appearance and has its own unique insights into technology, such as: TrackPoint (pointing stick, commonly known as the little red dot), ThinkLight keyboard light, full-size keyboard and APS (Active Protection System, active protection system) ).
Thinkpad is the most popular portable computer among developers of the open source operating system OpenBSD, and the ThinkPad X40 is one of the most supported portable computer models.