It’s no secret that the ACPI CPUFreq driver code has at times been less than ideal on recent AMD processors with delivering less than expected performance/behavior with being slow to ramp up to a higher performance state or otherwise coming up short of disabling the power management functionality outright. AMD hasn’t traditionally worked on the Linux CPU frequency scaling code as much as Intel does to their P-State scaling driver and other areas of power management at large.
AMD and Valve have been working to improve the performance/power efficiency for modern AMD platforms running on Steam Play (Proton / Wine) and have spearheaded “[The ACPI CPUFreq driver] was not very performance/power efficiency for modern AMD platforms…a new CPU performance scaling design for AMD platform which has better performance per watt scaling on such as 3D game like Horizon Zero Dawn with VKD3D-Proton on Steam.”
Valve has single-handedly made Linux a viable choice for people who play games, and with the Steam Deck on its way, their efforts are only going to ramp up. They’re doing this for their own bottom line, of course, but this is one of those cases where a corporate interest lines up perfectly with a consumer interest.