用cpupower工具修改，但是在修改過程中會遇到ERROR：
[root@wyx~]# cpupower frequency-set -f 1.6G
Setting cpu: 0
Error setting new values. Common errors:
- Do you have proper administration rights? (super-user?)
- Is the governor you requested available and modprobed?
- Trying to set an invalid policy?
- Trying to set a specific frequency, but userspace governor is not available,
for example because of hardware which cannot be set to a specific frequency
or because the userspace governor isn't loaded?
解決方法：
1. 在/etc/default/grub中加入 GRUB_CMDLINE_LINUX_DEFAULT="intel_pstate=disable"
2. 命令行輸入：
grub2-mkconfig -o /boot/grub2/grub.cfg
或者 grub-mkconfig -o /boot/grub/grub.cfg
3. 重啓機器 reboot（有些機器需要在bios裏關掉超線程以及Pstate,Cstate，有些不用，可以試一試。）
4. 重啓後輸入命令：
cpupower frequency-info --governors
cpupower frequency-set -g conservative
5. 可以用cpupower的命令修改頻率了
cpupower frequency-set -f 1.6G
修改完成。
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原文鏈接：https://blog.csdn.net/ConnieWu/article/details/80564259