Arch Linux

inscrutableoutput

Member

Registered: 2022-08-23

Posts: 5

[SOLVED] CPU ignores max frequency set by cpupower

I am trying to limit the CPU frequency on my laptop for power saving.  Unfortunately, my CPU us ignoring the limits set by cpupower.  It frequently runs at 2.5 GHz despite the cap being set at 2 GHz.

My cpupower config is

governor='powersave'
min_freq="300MHz"
max_freq="2GHz"

This issues is prevalent on both stock and LTS kernel.  I am running a Thinkpad X1 Carbon G10, with a 12 Gen i7-1260P.  Thank you in advance.

Last edited by inscrutableoutput (2022-10-06 14:06:07)

cfr

Member

From: Cymru

Registered: 2011-11-27

Posts: 7,132

Re: [SOLVED] CPU ignores max frequency set by cpupower

What is the result of

cat /sys/bus/cpu/devices/cpu*/cpufreq/scaling_driver 

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inscrutableoutput

Member

Registered: 2022-08-23

Posts: 5

Re: [SOLVED] CPU ignores max frequency set by cpupower

The output is

[user@arch ~]$ cat /sys/bus/cpu/devices/cpu*/cpufreq/scaling_driver 
intel_pstate 
intel_pstate 
intel_pstate 
intel_pstate 
intel_pstate 
intel_pstate 
intel_pstate 
intel_pstate 
intel_pstate 
intel_pstate 
intel_pstate 
intel_pstate 
intel_pstate 
intel_pstate 
intel_pstate 
intel_pstate 

Lone_Wolf

Member

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 11,911

Re: [SOLVED] CPU ignores max frequency set by cpupower

Maybe

However, the intel_pstate scaling driver in active mode will bypass the generic CPUFreq governors, providing its own scaling algorithms:

?

(1) https://wiki.archlinux.org/title/CPU_fr … _governors

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Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.

(A works at time B)  && (time C > time B ) ≠  (A works at time C)

inscrutableoutput

Member

Registered: 2022-08-23

Posts: 5

Re: [SOLVED] CPU ignores max frequency set by cpupower

Didn't see this.  That clears it up.  Thanks.