Are you sure about that ?
Because I’m on the zen kernel 6.14.2 and I can’t see an additional preset for the amd-pstate-epp governor
§ inxi -S
System:
Host: ndev Kernel: 6.14.2-zen1-1.1-zen arch: x86_64 bits: 64
Desktop: KDE Plasma v: 6.3.4 Distro: EndeavourOS
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
amd-pstate-epp
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
performance powersave