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kms: Add min_vrr refresh rate safety margin

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Victoria Brekenfeld 2025-07-22 17:16:50 +02:00 • committed by Victoria Brekenfeld
parent c3d2b5f0b7
commit a2dda33abe
1 changed files with 2 additions and 1 deletions
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3
src/backend/kms/surface/mod.rs
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@ -671,10 +671,11 @@ impl SurfaceThreadState {
Duration::from_secs_f64(1_000. / drm_helpers::calculate_refresh_rate(mode) as f64);
self.timings.set_refresh_interval(Some(interval));
const SAFETY_MARGIN: u32 = 2; // Magic two frames margin taken from kwin to not trigger low-framerate-compensation
let min_min_refresh_interval = Duration::from_secs_f64(1. / 30.); // 30Hz
self.timings.set_min_refresh_interval(Some(
min_hz
.map(|min| Duration::from_secs_f64(1. / min as f64))
.map(|min| Duration::from_secs_f64(1. / (min + SAFETY_MARGIN) as f64))
.unwrap_or(min_min_refresh_interval) // alternatively use 30Hz
.max(min_min_refresh_interval),
));