Non autonomous: OS scaling governor specifies operating frequency/performance level through Desired Performance register and PMFW follows that. The notes from the guided-autonomous patch series have been the most helpful to me so far:įrom ACPI spec below 3 modes for CPPC can be defined: And my cores are idling down to 550 MHz, which is great! Now I can easily enable amd_pstate and it works as expected. After some trial and error I found the culprit… I had enabled X2APIC on both X570 systems a few weeks ago to see if it was stable and working well enough to daily drive. So then I moved on to the next phase: trying to figure out which wacky BIOS setting I enabled that basically broke a big piece of ACPI. When I got back into Linux, I noticed right away that my cores were idling down to 2200 MHz (IIRC) and-et voilà!-/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver was showing acpi_cpufreq again. I went back into the BIOS, loaded optimal settings, then did a very basic config just to get my system posting again. And my test bench with an Asus Pro WS X570-ACE with a 3900X is having all of the same issues as well (and idling down to 3700 MHz, even in Windows). In addition to the above symptoms, I also noticed that my cores were idling down to 3400 MHz, which seemed a bit high. acpi_cpufreq, scaling_governor, energy_performance_preference, etc. There is literally nothing happening in the kernel for e.g.
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