A proposed Linux kernel change from Meta engineer David Vernet aims to improve frame-time consistency in some games by briefly boosting the CPU core that was just busy. In a July 2026 RFC, one Civilization VI test on a Steam Deck showed 31.8% higher 1%-low FPS, but average FPS did not change. The patch was still under discussion in October 2026, and the tested change should not be confused with a feature already included in SteamOS.
What the proposed AMD P-State change does
AMD P-State is a Linux CPU frequency-scaling driver. Vernet’s July 28, 2026 RFC proposes an opt-in feature called epp_boost for systems using the MSR-based CPPC interface with AMD P-State in active EPP mode. EPP, or Energy Performance Preference, is a request that helps guide CPU performance and efficiency behavior.
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The proposal adds a scheduler update-util hook that samples each core’s busy time. When a sample meets the 50% busy threshold, the driver temporarily requests performance EPP for that core. It samples at most once every 10 milliseconds and restores the policy’s prior EPP value after 300 milliseconds without another qualifying busy sample. These settings describe the July RFC, not necessarily the later design direction.
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The problem it targets is a pattern common in games: a main or render thread does a short burst of CPU work, then briefly waits on something such as a futex or GPU fence. Vernet writes that a workload with “one mostly-busy thread that takes frequent short sleeps” can fare poorly when the performance signal drops during those pauses. If the core is slower when the thread resumes, the delay can contribute to worse frame-time outliers.
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What the Steam Deck benchmark found
Vernet’s RFC tested Civilization VI on a Steam Deck with a Van Gogh APU and EPP set to balance_performance. With epp_boost enabled, the busy core’s median frequency was 3.5 GHz. The reported results were:
| Measure | Reported change | What it means in this test |
|---|---|---|
| 1%-low FPS | 31.8% higher (p=0.014) | The low-end frame-rate measure improved; this is not a 31.8% increase in average FPS. |
| Frame-time p99 | 4.1% better (p=0.015) | The 99th-percentile frame time improved. |
| Frame-time p999 | Unchanged | No improvement was reported at the 99.9th percentile. |
| Average FPS | Unchanged | The average frame rate did not rise in the reported test. |
The RFC reports six interleaved A/B test iterations and says Welch’s t-test was used to calculate the deltas. Those results describe one game, device, configuration, and benchmark; they do not establish a typical gain across games or AMD handhelds.
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Per-core boosting versus global performance EPP
The RFC compares targeted boosting with setting EPP globally to performance. In that same benchmark discussion, global performance EPP also raised the busy core’s median frequency to 3.5 GHz and improved 1%-low FPS by about 16%. Unlike the proposed per-core behavior, however, the global setting affects every core and workload.
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What changed after the July RFC
The July benchmarked RFC is not the same thing as the later design direction. Phoronix reported on October 6, 2026, that review of the summer patch series had prompted a shift toward a governor-level design and other changes. Its report also described a dynamic-governor proposal and the possibility of thread hints from Wine or Proton.
The official Linux Plumbers Conference listing records Vernet’s October 5 session in Prague, “EPP-boost: Per-core util-based performance boosting in AMD p-state driver,” as a discussion of the RFC and gaming-related frequency-scaling gaps. These records establish that the design was still being discussed and revised; they do not establish that it merged into Linux or shipped in SteamOS. Consequently, the July RFC’s exact thresholds and benchmark should not be assumed to describe a final implementation.
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Does it already work on a Steam Deck?
The reported improvement comes from a proposed kernel-driver change, not a Steam Deck hardware revision. The available October 2026 status reports do not show that it has merged or reached SteamOS. Do not treat the RFC as an available Steam Deck setting or follow generic instructions to enable it: implementation status and controls may differ as the design evolves. Check the relevant kernel and SteamOS release notes for confirmation before assuming it is available.
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Buying a Steam Deck does not install this proposed feature or guarantee the benchmark delta; the benchmark describes a particular RFC build and test setup.
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