feat(power): lower refresh rate on battery (#2428)

* feat(power): lower refresh rate on battery (#1203)

Add a Power & Sleep setting that lowers eligible displays to 60 Hz on battery and restores their previous mode on AC power.

Skip displays without an available 60 Hz mode, displays with a single refresh-rate option, current modes at or below 60 Hz, and VRR-enabled outputs.
Apply niri changes at runtime through output commands and use wlr-output-management as fallback.

* fix(quickshell): debounce display refresh sync

* chore: regenerate settings_search_index.json for pre-commit CI fix

* fix: translator context is missing for lowerDisplayRefreshRateOnBattery

* fix: activeDisplayProfileModes is missing from SettingsSpec

* feat: added guard to syncRefreshRates function

* refactor(display): move refresh sync listeners to display service

* fix(display): publish active profile modes after config write

* feat(display): persist previous refresh modes

* fix(display): route refresh mode writes through compositor backends

* fix(display): detect preferred niri refresh modes

* some small cleanups

---------

Co-authored-by: bbedward <bbedward@gmail.com>

quickshell/Modules/Settings/DisplayConfig/DisplayConfigState.qml

@@ -264,6 +264,24 @@ Singleton {
             callback(true);
     }
 
+    function publishActiveProfileModes() {
+        const compositor = CompositorService.compositor;
+        const profileId = SettingsData.getActiveDisplayProfile(compositor);
+        const profile = profileId ? validatedProfiles[profileId] : null;
+        const outputs = profile?.outputs || {};
+        const modes = {};
+
+        for (const outputId in outputs) {
+            const mode = outputs[outputId]?.mode;
+            if (mode)
+                modes[outputId] = {
+                    "mode": mode
+                };
+        }
+
+        SettingsData.setActiveDisplayProfileModes(compositor, modes);
+    }
+
     function generateProfileId() {
         return "profile_" + Date.now() + "_" + Math.random().toString(36).slice(2, 9);
     }
@@ -362,6 +380,7 @@ Singleton {
                 };
                 validatedProfiles = updated;
                 matchedProfile = findMatchingProfile();
+                publishActiveProfileModes();
                 profileSaved(profileId, profileName);
             });
         });
@@ -543,6 +562,7 @@ Singleton {
         };
         const onWriteSuccess = () => {
             SettingsData.setActiveDisplayProfile(CompositorService.compositor, configId);
+            publishActiveProfileModes();
             if (isManual) {
                 profilesLoading = false;
                 profileActivated(configId, profileName);
@@ -586,6 +606,7 @@ Singleton {
                 writeMonitorsJson(data, null);
             validatedProfiles = validated;
             matchedProfile = findMatchingProfile();
+            publishActiveProfileModes();
             if (!profilesReady) {
                 profilesReady = true;
                 applyAutoConfig();
@@ -633,6 +654,7 @@ Singleton {
                 currentOutputSet = buildCurrentOutputSet();
                 matchedProfile = findMatchingProfile();
                 SettingsData.setActiveDisplayProfile(CompositorService.compositor, id);
+                publishActiveProfileModes();
                 profileSaved(id, profileName);
             });
         });
@@ -678,6 +700,7 @@ Singleton {
                 delete updated[profileId];
                 validatedProfiles = updated;
                 matchedProfile = findMatchingProfile();
+                publishActiveProfileModes();
                 profileDeleted(profileId);
             });
         });
@@ -890,6 +913,14 @@ Singleton {
         target: CompositorService
         function onCompositorChanged() {
             root.checkIncludeStatus();
+            root.publishActiveProfileModes();
+        }
+    }
+
+    Connections {
+        target: SettingsData
+        function onActiveDisplayProfileChanged() {
+            root.publishActiveProfileModes();
         }
     }
 
@@ -2251,7 +2282,16 @@ Singleton {
                 "name": match.entry.name || "",
                 "outputs": outputConfigs
             };
-            writeMonitorsJson(data, null);
+            writeMonitorsJson(data, success => {
+                if (!success || !profileId)
+                    return;
+                const updated = JSON.parse(JSON.stringify(validatedProfiles));
+                if (updated[profileId]) {
+                    updated[profileId].outputs = outputConfigs;
+                    validatedProfiles = updated;
+                    publishActiveProfileModes();
+                }
+            });
         });
 
         clearPendingChanges();

quickshell/Modules/Settings/PowerSleepTab.qml

@@ -187,6 +187,16 @@ Item {
                     }
                 }
 
+                SettingsToggleRow {
+                    settingKey: "lowerDisplayRefreshRateOnBattery"
+                    tags: ["power", "battery", "display", "refresh", "rate", "60hz", "hz"]
+                    text: I18n.tr("Lower display refresh rate on battery", "setting title under power & sleep tab")
+                    description: I18n.tr("Switch displays with an available 60 Hz mode to 60 Hz on battery and restore the previous mode on AC. Skips displays with VRR enabled.")
+                    checked: SettingsData.lowerDisplayRefreshRateOnBattery
+                    visible: BatteryService.batteryAvailable
+                    onToggled: checked => SettingsData.set("lowerDisplayRefreshRateOnBattery", checked)
+                }
+
                 Rectangle {
                     width: parent.width
                     height: 1