Summer is coming, and some strange software and hardware problems are beginning to appear again. Recently, a friend reported to the author that after the notebook was restored from sleep mode, the CPU frequency was locked at 0.39ghz, which remained at this frequency regardless of whether it was plugged in or not, causing the system to get stuck! How to solve this? In fact, it is related to the power policy of windows. When the battery is detected to be low, the windows system will forcibly shut down. But at the same time, windows will also preempt to write the current memory data to the hard disk before shutting down, so as to facilitate recovery at the next boot time without losing work progress. In fact, the system enters a sleep state rather than a complete shutdown. When writing data to the hard disk, in order to prevent writing failure caused by sudden power failure, the system may control the CPU frequency at a relatively low frequency to reduce energy consumption and ensure the completion of the data writing process. In addition, when the laptop heats up too much, it may also trigger the CPU to forcibly reduce the frequency and lock the CPU frequency to a lower frequency, which is more common at 0.39ghz or 0.78ghz. After triggering the CPU frequency reduction, the system may also be forced to sleep, and enter the sleep state after writing the memory data to the hard disk. Win10 and win11 have similar mechanisms. However, the problem is coming. There may be a bug in the mechanism of entering the sleep state after the CPU frequency is reduced. When the computer recovers from sleep, the CPU frequency may not recover, but still remains at low frequencies such as 0.39ghz! This leads to the situation that the CPU frequency is locked at 0.39ghz as mentioned at the beginning of the article, and the whole system is slow and cannot be used normally. In this case, even restarting the computer may not be able to solve, because restarting is a hot start, and the hardware will not be detected and the data will not be reloaded. If win10 and win11 save some state data before shutdown, it is likely that even the frequency locking state of the CPU will continue to be maintained after restarting. How to solve this problem? Here are two solutions to try. Long press the power key to force shutdown and restart When the system recovers, it brings the state data before hibernation, which may be the inducement of CPU frequency locking. If frequency locking occurs, we can try to solve it by long pressing the power key to force the shutdown. Long press the power key to force shutdown. The computer will not save any data before shutdown, and will also clear some settings related to system status. When the computer is turned on again, it is a cold start, the CPU lock setting is cleared, and the frequency returns to normal. Generally speaking, this is a bug caused by CPU frequency reduction when the system enters sleep state or overheat protection. If you encounter a similar situation, you might as well try the method of this article, and I hope Microsoft can fix this problem as soon as possible! (Xinhua News Agency)