New AMD Linux Patch Improves Low-End Gaming Performance on Steam Deck in EPP Mode

Addressing Performance in EPP Mode

A new patch for AMD's Linux drivers aims to improve gaming performance on devices like the Steam Deck. The patch specifically targets issues encountered when AMD-based gaming hardware operates in Energy Performance Preference (EPP) mode, which is designed to balance performance and energy efficiency.

The Problem with Current Drivers

Kernel coder David Vernet identified that the current AMD driver misinterprets frequent, short sleep periods of busy threads. This misinterpretation leads the driver to lower its average performance target, causing threads to wake up at a lower frequency than desired. The result is increased frame latency, stale frames, and longer frame generation times, particularly at the low end of the performance distribution.

Impact on Gaming Experience

These performance issues manifest as low-end frame hitches, which can disrupt the gaming experience. While shifting the processor to "performance" mode can mitigate the problem, it negates the energy savings that EPP mode is intended to provide. Additionally, simply boosting an affected thread's minimum performance target can worsen low-end performance due to the complexities of CPU/GPU boost management.

Benefits for Steam Deck Users

This driver update is particularly relevant for Steam Deck owners, as it could extend the device's usable life by improving gaming performance without sacrificing energy efficiency. The patch allows users to benefit from EPP mode's power savings while maintaining smoother gameplay, especially in scenarios where frame rate consistency is crucial.