From 7fd2f731e790fa41f4dd897551e896079c13c776 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Thu, 25 Jun 2026 20:36:10 +0200
Subject: [PATCH] fix: apply target refresh rate to newly-enabled displays in
 staged mode

Phase 2 of staged application only flipped the active/inactive path
flags via ApplyDisplayTopology, without selecting a target mode. A
monitor transitioning from disabled to enabled could therefore come up
at whatever default refresh rate Windows picked (often 60Hz) instead of
the rate stored in the profile. Explicitly call ChangeResolution for
newly-enabled displays after Phase 2, mirroring what Phase 1 already
does for already-active displays.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 src/Core/ProfileManager.cs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/Core/ProfileManager.cs b/src/Core/ProfileManager.cs
index 26be230..67ae5b2 100644
--- a/src/Core/ProfileManager.cs
+++ b/src/Core/ProfileManager.cs
@@ -863,6 +863,22 @@ private bool ApplyStagedConfiguration(List<DisplayConfigHelper.DisplayConfigInfo
                     return false;
                 }
 
+                // Explicitly apply resolution and refresh rate for monitors that were just activated in this phase.
+                // ApplyDisplayTopology only flips the active/inactive flags - it does not select a target mode,
+                // so a newly-enabled monitor can come up at whatever default mode Windows picks (often 60Hz).
+                var newlyEnabledConfigs = targetConfigs
+                    .Where(tc => tc.IsEnabled && !phase1Configs.Any(p => p.TargetId == tc.TargetId && p.SourceId == tc.SourceId))
+                    .ToList();
+
+                foreach (var config in newlyEnabledConfigs)
+                {
+                    logger.Debug($"Phase 2: Changing mode for newly-enabled {config.DeviceName} to {config.Width}x{config.Height}@{config.RefreshRate}Hz");
+                    if (!DisplayHelper.ChangeResolution(config.DeviceName, config.Width, config.Height, (int)config.RefreshRate))
+                    {
+                        logger.Warn($"Phase 2: Failed to change resolution for newly-enabled display {config.DeviceName}.");
+                    }
+                }
+
                 // Apply final positions for all monitors
                 if (!DisplayConfigHelper.ApplyDisplayPosition(targetConfigs))
                 {