AMD P-State v4 Linux Testing On A Ryzen 5 5500U
When using the "performance" governor for running the Jetstream 2 benchmark in Google Chrome, the "performance" governor was yielding quite similar between drivers as would be expected with generally keeping the processor in its highest performance state. But when it came to the ondemand and schedutil governors, amd-pstate was trailing acpi-cpufreq for the raw performance. For the powersave governor, amd-pstate also trailed acpi-cpufreq.
During this benchmark, using the amd-pstate driver with ondemand/schedutil did save about 0.4 Watts compared to acpi-cpufreq....
On a performance-per-Watt basis, this put amd-pstate ondemand out in front followed immediately by acpi-cpufreq in its ondemand configuration.
Aside from when in powersave mode where the CPU performance state was at a minimum, for this laptop wasn't much of a difference between governors and drivers for this Lenovo laptop.
For ET: Legacy, Xonotic, and Tesseract among other open-source games, the results were quite close. Powersave led to much lower performance but with leading power efficiency.