Amd_pstate - latest kernels ( 6.15 or more ) and Zen2

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there many changes on amd-pstate on end 6.14.9 kernel and new series 6.15
can you use : amd-pstate ( no more amd_pstate.share_mem=1 )
UEFI up to date for your UEFI motherboard version
CPPC active

you can without option , you should see
amd-pstate-epp , with scheduler powersave_perfomance

if you try with
amd-pstate=active or passive or guided, you will see older scheduler ( schedutil , balance , perfomance and powersave )

check all cases with

cpupower frequency-info
sudo lscpu -ae

see changes on amd-pstate
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/drivers/cpufreq

documentation
https://www.kernel.org/doc/html/latest/admin-guide/pm/amd-pstate.html#kernel-module-options-for-amd-pstate

see also this topic i you really want lower frequency

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