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/sys/devices/system/cpu/cpu0 中缺少 cpufreq

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/sys/devices/system/cpu/cpu0 中缺少 cpufreq 
/sys/devices/system/cpu/cpu0# ls
cache        crash_notes_size  firmware_node  microcode  power      topology
crash_notes  driver            hotplug        node0      subsystem  uevent

我搜索了 cpuinfo_cur_freq not found 并且 cpuinfo_cur_freq does not exist - 没有找到

cat /proc/cpuinfo | grep "MHz"
cpu MHz     : 3269.310
cpu MHz     : 3291.034
cpu MHz     : 3094.668
cpu MHz     : 2641.935

所以 CPU 的速度不同

编辑：

description: CPU
          product: AMD Ryzen 3 1200 Quad-Core Processor
cpufreq-info --driver gives no output
uname -a Linux ub7 5.8.0-44-generic #50-Ubuntu SMP Tue Feb 9 06:29:41 UTC 021 x86_64 x86_64 x86_64 GNU/Linux
frequency scaling is enabled in BIOS = Yes
Description:    Ubuntu 20.10 Release:   20.10

所以看起来好像没有安装 CPU 频率调整驱动程序，我需要驱动程序吗，因为看起来 CPU 频率在没有驱动程序的情况下正在改变

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