From 9d522ed51e75d1253793f9f5ec42b8faf36e47e7 Mon Sep 17 00:00:00 2001
From: Ivan Molodetskikh <yalterz@gmail.com>
Date: Thu, 20 Nov 2025 12:55:45 +0300
Subject: tty: Throttle VBlanks on displays running faster than expected

Co-authored-by: Christian Meissl <meissl.christian@gmail.com>
Co-authored-by: Scott McKendry <39483124+scottmckendry@users.noreply.github.com>
---
 src/backend/tty.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/backend')

diff --git a/src/backend/tty.rs b/src/backend/tty.rs
index 891e8c79..fcae8087 100644
--- a/src/backend/tty.rs
+++ b/src/backend/tty.rs
@@ -1633,6 +1633,22 @@ impl Tty {
             presentation_time
         };
 
+        if output_state
+            .vblank_throttle
+            .throttle(refresh_interval, time, move |state| {
+                let meta = DrmEventMetadata {
+                    sequence: meta.sequence,
+                    time: DrmEventTime::Monotonic(Duration::ZERO),
+                };
+
+                let tty = state.backend.tty();
+                tty.on_vblank(&mut state.niri, node, crtc, meta);
+            })
+        {
+            // Throttled.
+            return;
+        }
+
         let redraw_needed = match mem::replace(&mut output_state.redraw_state, RedrawState::Idle) {
             RedrawState::WaitingForVBlank { redraw_needed } => redraw_needed,
             state @ (RedrawState::Idle
-- 
cgit