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I am trying to disable the intel pstate cpufreq driver and replace it with acpi to get maximum cpu control. I tried this.

vim /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="intel_pstate=disable quiet splash" or GRUB_CMDLINE_LINUX_DEFAULT="intel_pstate=disable" in a separate line grub-mkconfig -o /boot/grub/grub.cfg No change so i reboot reboot sudo service cpufreqd restart sudo modprobe acpi-cpufreq

When i do cpufreq-info it still shows

. . .analyzing CPU 23: driver: intel_pstate CPUs which run at the same hardware frequency: 23 CPUs which need to have their frequency coordinated by software: 23 maximum transition latency: 0.97 ms. hardware limits: 1.20 GHz - 3.30 GHz available cpufreq governors: performance, powersave current policy: frequency should be within 3.30 GHz and 3.30 GHz. The governor "performance" may decide which speed to use within this range. current CPU frequency is 3.12 GHz (asserted by call to hardware). analyzing CPU 24: driver: intel_pstate CPUs which run at the same hardware frequency: 24 CPUs which need to have their frequency coordinated by software: 24 maximum transition latency: 0.97 ms. hardware limits: 1.20 GHz - 3.30 GHz available cpufreq governors: performance, powersave current policy: frequency should be within 3.30 GHz and 3.30 GHz. The governor "performance" may decide which speed to use within this range. current CPU frequency is 2.39 GHz (asserted by call to hardware). analyzing CPU 25: driver: intel_pstate CPUs which run at the same hardware frequency: 25 CPUs which need to have their frequency coordinated by software: 25 maximum transition latency: 0.97 ms. hardware limits: 1.20 GHz - 3.30 GHz available cpufreq governors: performance, powersave current policy: frequency should be within 3.30 GHz and 3.30 GHz. The governor "performance" may decide which speed to use within this range. current CPU frequency is 1.26 GHz (asserted by call to hardware). analyzing CPU 26: driver: intel_pstate CPUs which run at the same hardware frequency: 26 CPUs which need to have their frequency coordinated by software: 26 maximum transition latency: 0.97 ms. hardware limits: 1.20 GHz - 3.30 GHz available cpufreq governors: performance, powersave current policy: frequency should be within 3.30 GHz and 3.30 GHz. The governor "performance" may decide which speed to use within this range. current CPU frequency is 3.27 GHz (asserted by call to hardware). analyzing CPU 27: driver: intel_pstate CPUs which run at the same hardware frequency: 27 CPUs which need to have their frequency coordinated by software: 27 maximum transition latency: 0.97 ms. hardware limits: 1.20 GHz - 3.30 GHz available cpufreq governors: performance, powersave current policy: frequency should be within 3.30 GHz and 3.30 GHz. The governor "performance" may decide which speed to use within this range. current CPU frequency is 2.17 GHz (asserted by call to hardware).

I have also tried to load the modules by editing /etc/default/modules/acpi to modules="all" and reboot but it does not work

What am i doing wrong here?

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  • maybe try GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_pstate=disable" Might also need sudo update-grub after it. Also possibly see serverfault.com/a/716347 Commented Jan 25, 2020 at 9:29

1 Answer 1

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intel_pstate manages compatible CPUs in a more fine-grained manner than the ACPI driver can, so in general you’re better off letting it handle things.

With recent kernels, it is possible to disable it, in some cases, after boot. To do so, write off to /sys/devices/system/cpu/intel_pstate/status; if this is successful (see the documentation for limitations), you should then be able to use the ACPI driver instead. You might need to disable HWP for this to work; to do that, add intel_pstate=no_hwp to your kernel boot parameters.

(The documentation does mention that intel_pstate=disable should prevent it from registering at all, so the fact that that’s not working for you is somewhat surprising and may indicate a bug.)

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  • Yes intel_pstate=disable is not working. I tried intel_pstate=no_hwp but i has created havoc on my system :) Commented Sep 7, 2018 at 11:22
  • How can I disable both intel_pstate and acpi-cpufreq, so that it drops down to speedstep-lib driver? I tried modprobe.blacklist=acpi-cpufreq to no avail. Commented Dec 30, 2021 at 1:18

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