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intel_pstate 驱动程序添加到 grub 文件时未加载

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intel_pstate 驱动程序添加到 grub 文件时未加载

我有一个

Processor   Intel(R) Core(TM) i7-4700MQ CPU @ 2.40GHz
Memory  16305MB (2531MB used)
Machine Type    Laptop
Operating System    Ubuntu 20.04.3 LTS

在我的/etc/默认/grub文件我有行

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=enable"

我做了一个sudo 更新 grub经过更改，但当我做一个 cpupower 频率信息或 cpufreq 信息 --driver它说使用的驱动程序是英特尔CPU频率

rt@sys76:~$ cpufreq-info --driver
intel_cpufreq


rt@sys76:~$ cpupower frequency-info

analyzing CPU 0:
  driver: intel_cpufreq
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 20.0 us
  hardware limits: 800 MHz - 3.40 GHz
  available cpufreq governors: conservative ondemand userspace powersave performance schedutil
  current policy: frequency should be within 1.70 GHz and 3.40 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 798 MHz (asserted by call to kernel)
  boost state support:
    Supported: yes
    Active: yes
rt@sys76:~$

我如何获得cpufreq-信息--驱动程序 使用英特尔_pstate司机？

答案1

您的处理器 i7-4700MQ 早于 HWP（硬件 Pstate）控制。对​​于这些英特尔处理器，内核电源管理组确定的迁移路径是默认使用 schedutil 缩放调节器将 intel_pstate CPU 频率缩放驱动程序置于被动模式。为此，进行了以下提交：

提交 33aa46f252c703e42c81a76696cd0c240f2281e4 作者：Rafael J. Wysocki[电子邮件保护]日期：2020 年 3 月 25 日（星期三）15:03:35 +0100

cpufreq: intel_pstate: Use passive mode by default without HWP

After recent changes allowing scale-invariant utilization to be
used on x86, the schedutil governor on top of intel_pstate in the
passive mode should be on par with (or better than) the active mode
"powersave" algorithm of intel_pstate on systems in which
hardware-managed P-states (HWP) are not used, so it should not be
necessary to use the internal scaling algorithm in those cases.

Accordingly, modify intel_pstate to start in the passive mode by
default if the processor at hand does not support HWP of if the driver
is requested to avoid using HWP through the kernel command line.

Among other things, that will allow utilization clamps and the
support for RT/DL tasks in the schedutil governor to be utilized on
systems in which intel_pstate is used.

您实际上正在使用 intel_pstate CPU 频率调节驱动程序，但它处于被动模式。尝试以下操作：

echo active | sudo tee /sys/devices/system/cpu/intel_pstate/status

然后检查：

cat /sys/devices/system/cpu/intel_pstate/status

如果一切按预期进行，则将 grub 行更改为：

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=active"

看看它是否按您希望的方式启动。

请注意，CPU频率调节驱动程序intel_cpufreq只是intel_pstate被动模式下的驱动程序。

例子：

doug@s19:~/temp$ grep . /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu10/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu11/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu1/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu2/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu3/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu4/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu5/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu6/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu7/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu8/cpufreq/scaling_driver:intel_cpufreq
/sys/devices/system/cpu/cpu9/cpufreq/scaling_driver:intel_cpufreq

doug@s19:~/temp$ cat /sys/devices/system/cpu/intel_pstate/status
passive
doug@s19:~/temp$ echo active | sudo tee /sys/devices/system/cpu/intel_pstate/status
active

doug@s19:~/temp$ grep . /sys/devices/system/cpu/cpu*/cpufreq/scaling_driver
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu10/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu11/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu1/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu2/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu3/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu4/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu5/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu6/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu7/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu8/cpufreq/scaling_driver:intel_pstate
/sys/devices/system/cpu/cpu9/cpufreq/scaling_driver:intel_pstate

答案2

笔记本电脑的电源停止工作，我更换了它。突然间，CPU 又开始正常工作了。看起来电源出了问题，没有输出足够的电流。

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