ThinkPad’s CPU can be variable-frequency by default, so when using the battery alone, in order to save power, the CPU usually runs at reduced frequency after entering the system. When a large amount of data is exchanged between the CPU and the system, the CPU will automatically increase the main frequency to complete the data processing at a higher speed. After completion, it will automatically lower the main frequency back to the power-saving frequency, so that the frequency is high and the frequency is low. There will be a slight current sound when switching frequencies, which is normal.

The solution is as follows:

1. Boot into BIOS-Config-Power-CPU Power Management-change Automatic to Disable.

2. If it is not for mobile use, you can choose to connect it to AC.

Summary

The purpose of changing the BIOS to DISABLE mode is to force the CPU frequency to the highest level, so there is no switching back and forth between up and down frequency. So there will be no sound. However, if the CPU is always at the highest frequency, it will affect the battery life. In addition, when connecting to an external power supply, the Think machine is pre-installed with power management software, so when the user connects the power supply, the machine's power management software will automatically debug the host to the best performance state, so the current will also be improved. Voice.

ThinkPad, also known as "ThinkPad" in Chinese, was a portable computer brand under the IBM PC Division before 2005. Reliable features enjoy a high reputation in the industry. 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 even more popular.One of the portable computer models supported by the system.