How to use AMD P-State in Linux

General system Kernel, boot, graphics & hardware
422

I thought your output showed it was active yes? :thinking:

423

This command isn’t working? Is it missing a pipe?

  1. c ↩︎

424
$ LANG=C cpupower frequency-info 
analyzing CPU 13:
  driver: amd-pstate-epp
  CPUs which run at the same hardware frequency: 13
  CPUs which need to have their frequency coordinated by software: 13
  maximum transition latency:  Cannot determine or is not supported.
  hardware limits: 550 MHz - 4.55 GHz
  available cpufreq governors: performance powersave
  current policy: frequency should be within 550 MHz and 4.55 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 3.60 GHz (asserted by call to kernel)
  boost state support:
    Supported: yes
    Active: no

Perhaps it is disabled due to the fact that now I’m using active amd-pstate-epp active | powersave governor with energy_performance_preference set to powersave (power) ?

425

watch -n1 "grep \"^[c]pu MHz\" /proc/cpuinfo"

426

Okay it works but i don’t know how to copy it when it’s running?

  1. c ↩︎

427

Increase the n1 to n3 or something like that so you have enough time to do it…

428 
Every 3.0s: grep "^[c]pu MHz" /proc/cpuinfo                              eos-kde: Tue Aug  1 12:52:41 2023

cpu MHz         : 550.000
cpu MHz         : 550.000
cpu MHz         : 550.000
cpu MHz         : 550.000
cpu MHz         : 3599.857
cpu MHz         : 550.000
cpu MHz         : 550.000
cpu MHz         : 550.000
cpu MHz         : 550.000
cpu MHz         : 550.000
cpu MHz         : 550.000
cpu MHz         : 3921.614
cpu MHz         : 550.000
cpu MHz         : 550.000
cpu MHz         : 550.000
cpu MHz         : 550.000
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429

How do you set the settings from balance_performance to what you have?

430

In Gnome, I just click at the top of the screen, right side:

image
image641×549 30.1 KB

Desempenho means Performance
Balanceado means Balanced
Economia de energia means Powersave ← Selected this one

431

for a generic solution:

mind the link inside that post to the instructions on how to set up a systemd-service that runs the script

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432

I’m on KDE so i guess i have to do it from the command line?

433

You need to have power-profiles-daemon.service installed.

Check if you can find this icon in system tray as mentioned by HBR

434

I thought there was an easy way to change the power scheme?

435

I have the power management notification but it doesn’t allow me to change it? So does that mean i need to install power-profiles-daemon and enable it?

Edit:

Screenshot_20230801_130518
Screenshot_20230801_1305181920×1080 135 KB

Screenshot_20230801_130553
Screenshot_20230801_1305531920×1080 135 KB

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436

I suppose so, here it is enabled and it is working

$ sudo systemctl status power-profiles-daemon.service 
● power-profiles-daemon.service - Power Profiles daemon
     Loaded: loaded (/usr/lib/systemd/system/power-profiles-daemon.service; enabled; preset: disabled)
     Active: active (running) since Tue 2023-08-01 13:08:34 -03; 56min ago
   Main PID: 635 (power-profiles-)
      Tasks: 4 (limit: 38379)
     Memory: 5.6M
        CPU: 19ms
     CGroup: /system.slice/power-profiles-daemon.service
             └─635 /usr/lib/power-profiles-daemon

ago 01 13:08:34 eos systemd[1]: Starting Power Profiles daemon...
ago 01 13:08:34 eos systemd[1]: Started Power Profiles daemon.
437

Uaww, nice wallpaper… :+1: :+1:

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438

Is running on mine also but when i try to change it in the power management the slider jumps back to where it’s set.

439

hmm, let me google it to see if I can help

440

Must be different on Gnome?

441

Maybe, the daemon is the same as far as I’m concerned, it should work in KDE the same way as it works in Gnome..
Have you tried to reboot after enabling that service?
Perhaps a reboot or a logout is required for the DE to see it..