cpupower frequency 无法设置userspace的问题

1. Disable intel_pstate in grub configure file:

   $ sudo vi /etc/default/grub
   

   Append "intel_pstate=disable" to GRUB_CMDLINE_LINUX= option

2. Refresh grub boot configuration file:

   For Ubuntu:

   $ sudo update-grub
   

   For Fedora:

   $ sudo grub2-mkconfig -o /boot/grub2/grub.cfg
   

3. Reboot.

   $ sudo reboot
   

4. Set CPU power governor to userspace:

   $ sudo cpupower frequency-set --governor userspace
   

5. Set CPU frequency:

   $ sudo cpupower --cpu all frequency-set --freq 1.5GHz
   

6. Verify:

   $ cpupower frequency-info
   

   You should see line: "current CPU frequency is 1.50 GHz."

如果上述方法没有作用，再进入/boot/grub2/grub.cfg中查看，是否有intel_pstate=disable。如果没有，添加上。

如果还是没有用

 For BIOS install:

Code: grub2-mkconfig -o /boot/grub2/grub.cfg

For UEFI install: Code: grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg 

在linuxefi之后添加intel_pstate=disable。