disable adaptive sync with no_vfr off

src/config/ConfigManager.cpp

@@ -1204,6 +1204,7 @@ void CConfigManager::loadConfigLoadVars() {
 
         // check
         ensureDPMS();
+        ensureVRR();
     }
 
     // Update window border colors
@@ -1535,6 +1536,40 @@ void CConfigManager::ensureDPMS() {
     }
 }
 
+void CConfigManager::ensureVRR() {
+    static auto *const PNOVRR = &getConfigValuePtr("misc:no_vfr")->intValue;
+    
+    for (auto& m : g_pCompositor->m_vMonitors) {
+        if (!*PNOVRR && !m->vrrActive) {
+            // Adaptive sync (VRR)
+            wlr_output_enable_adaptive_sync(m->output, 1);
+
+            if (!wlr_output_test(m->output)) {
+                Debug::log(LOG, "Pending output %s does not accept VRR.", m->output->name);
+                wlr_output_enable_adaptive_sync(m->output, 0);
+            }
+
+            if (!wlr_output_commit(m->output)) {
+                Debug::log(ERR, "Couldn't commit output %s in ensureVRR -> true", m->output->name);
+            }
+
+            m->vrrActive = true;
+
+            Debug::log(LOG, "VRR ensured on %s -> true", m->output->name);
+        } else if (*PNOVRR && m->vrrActive) {
+            wlr_output_enable_adaptive_sync(m->output, 0);
+
+            if (!wlr_output_commit(m->output)) {
+                Debug::log(ERR, "Couldn't commit output %s in ensureVRR -> false", m->output->name);
+            }
+
+            m->vrrActive = false;
+
+            Debug::log(LOG, "VRR ensured on %s -> false", m->output->name);
+        }
+    }
+}
+
 SAnimationPropertyConfig* CConfigManager::getAnimationPropertyConfig(const std::string& name) {
     return &animationConfig[name];
 }

src/config/ConfigManager.hpp

@@ -151,6 +151,7 @@ public:
     bool                m_bForceReload = false;
     bool                m_bNoMonitorReload = false;
     void                ensureDPMS();
+    void                ensureVRR();
 
     std::string         parseKeyword(const std::string&, const std::string&, bool dynamic = false);
 

src/helpers/Monitor.cpp

@@ -136,6 +136,9 @@ void CMonitor::onConnect(bool noRule) {
     g_pLayoutManager->getCurrentLayout()->recalculateMonitor(ID);
 
     g_pEventManager->postEvent(SHyprIPCEvent{"monitoradded", szName});
+
+    // ensure VRR (will enable if necessary)
+    g_pConfigManager->ensureVRR();
 }
 
 void CMonitor::onDisconnect() {

src/helpers/Monitor.hpp

@@ -38,6 +38,7 @@ public:
     wl_output_transform transform = WL_OUTPUT_TRANSFORM_NORMAL;
 
     bool        dpmsStatus = true;
+    bool        vrrActive = false; // this can be TRUE even if VRR is not active in the case that this display does not support it.
 
     // mirroring
     CMonitor*   pMirrorOf = nullptr;

src/render/Renderer.cpp

@@ -1153,20 +1153,13 @@ bool CHyprRenderer::applyMonitorRule(CMonitor* pMonitor, SMonitorRule* pMonitorR
         }
     }
 
+    wlr_output_enable_adaptive_sync(pMonitor->output, 0); // disabled here, will be tested in CConfigManager::ensureVRR()
 
     wlr_output_set_transform(pMonitor->output, pMonitorRule->transform);
     pMonitor->transform = pMonitorRule->transform;
 
     pMonitor->vecPixelSize = pMonitor->vecSize;
 
-    // Adaptive sync (VRR)
-    wlr_output_enable_adaptive_sync(pMonitor->output, 1);
-
-    if (!wlr_output_test(pMonitor->output)) {
-        Debug::log(LOG, "Pending output %s does not accept VRR.", pMonitor->output->name);
-        wlr_output_enable_adaptive_sync(pMonitor->output, 0);
-    }
-
     if (!wlr_output_commit(pMonitor->output)) {
         Debug::log(ERR, "Couldn't commit output named %s", pMonitor->output->name);
         return true;