Hello, I just switched my setup from an 8th gen intel to the ryzen using a B550 motherboard. I changed the settings in the BIOS to enable C-states and everything, but I'm only seeing C1, C2 and C3 in powertop.

I saw a mention of amd_pstate but even using the latest unRAID (7.2.3) I cannot seem to get that module to be enabled. When looking at the "Tips and Tweaks" plugin it shows that I'm using Driver: ACPI CPU Freq instead of amd_pstate. Isn't amd_pstate supposed to be active by default? When running modprobe amd_pstate I get hit by the exception: modprobe: FATAL: Module amd_pstate not found in directory /lib/modules/6.12.54-Unraid. I did also set amd_pstate=passive to no avail. Any help with getting this working would be appreciated.

Edited January 8Jan 8 by Ter

7 minutes ago, Ter said:

Isn't amd_pstate supposed to be active by default?

Yes, if the board BIOS supports it, and it's not disabled in syslinux.

After going through hardwareluxx I found someone with the same motherboard as me (Asus TUF B550M Plus). They did have amd_pstate working so I copied their BIOS settings but unfortunately it did not work with the latest BIOS. After downgrading to the same version (3607) the module immediately started working when I booted back up into unRAID, so I'm going to blame this on the BIOS update breaking things, although it is kind of odd.