Disabling P-States?

[benutzer74]

Pardon for abusing the Issues board to ask something....
What is the purpose of disabling P-States? Power saving or stability?
I have a mobile Raven Ridge (Ryzen 5 2500U) and one thing I don´t understand.
cpupower reports 3 P-States, P-State 0 2600 Mhz, State P1 2700 Mhz, State P2 2400 Mhz.
At the same time, cpupower says clock rate can be between 1.6 Ghz and 2.0 Ghz.
Why can P-States go above reported clock rate?
Thank you very, very much!

[ghtux]

According to https://www.amd.com/en/products/apu/amd-ryzen-5-2500u
between 2 and 3.6 GHz are available.
The purpose of disabling c-state here is stability at least for desktop Zen gen 1 CPUs.

zenstates.py -l
C6 disabled all fine here. With c6 enabled my system froze many times in idle mode.