Amd-pstate & amd-pstate-epp - Kernel 6.14.2 or more

Hello

since version 6.14.2 new energy is possible with amd-pstate-epp :

you will get status balance_performance , it required

  • UEFI option CPPC on
  • check with
cpupower frequency-info
analyse du CPU 5 :
  driver: amd-pstate-epp
  CPUs which run at the same hardware frequency: 5
  CPUs which need to have their frequency coordinated by software: 5
  energy performance preference: balance_performance
  limitation matérielle : 550 MHz - 4.65 GHz
  régulateurs disponibles : performance powersave
  tactique actuelle : la fréquence doit être comprise entre 1.74 GHz et 4.65 GHz.
                  Le régulateur "powersave" est libre de choisir la vitesse
                  dans cette plage de fréquences.
  current CPU frequency: 3.56 GHz (asserted by call to kernel)
  boost state support:
    Supported: yes
    Active: yes
  amd-pstate limits:
    Highest Performance: 166. Maximum Frequency: 4.65 GHz.
    Nominal Performance: 132. Nominal Frequency: 3.70 GHz.
    Lowest Non-linear Performance: 62. Lowest Non-linear Frequency: 1.74 GHz.
    Lowest Performance: 20. Lowest Frequency: 550 MHz.
    Preferred Core Support: 1. Preferred Core Ranking: 181.

values min / max frequency can be checked

sudo lscpu -ae

CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE    MAXMHZ   MINMHZ       MHZ
  0    0      0    0 0:0:0:0          oui 4654,0000 550,0000 3436,0569
  1    0      0    1 1:1:1:0          oui 4654,0000 550,0000 3704,6399
  2    0      0    2 2:2:2:0          oui 4654,0000 550,0000 3277,5811
  3    0      0    3 3:3:3:0          oui 4654,0000 550,0000 4090,6780
  4    0      0    4 4:4:4:0          oui 4654,0000 550,0000 3704,2529
  5    0      0    5 5:5:5:0          oui 4654,0000 550,0000 3744,2839
  6    0      0    0 0:0:0:0          oui 4654,0000 550,0000 3778,2290
  7    0      0    1 1:1:1:0          oui 4654,0000 550,0000 3599,4641
  8    0      0    2 2:2:2:0          oui 4654,0000 550,0000 3280,5730
  9    0      0    3 3:3:3:0          oui 4654,0000 550,0000 1738,0000
 10    0      0    4 4:4:4:0          oui 4654,0000 550,0000 3277,6631
 11    0      0    5 5:5:5:0          oui 4654,0000 550,0000 3616,7571

if you have not amd-pstate or amd-pstate-epp appears ( acpi-cpufreq) ,
you should add on boot command kernel

amd-pstate=active ( with boost) , or passive( without) , or guided ( min/max HW frequency)