Power applet, settings: Add support for ambient light sensor.

files/usr/share/cinnamon/applets/power@cinnamon.org/applet.js

@@ -15,6 +15,7 @@ const BrightnessBusName = "org.cinnamon.SettingsDaemon.Power.Screen";
 const KeyboardBusName = "org.cinnamon.SettingsDaemon.Power.Keyboard";
 
 const CSD_BACKLIGHT_NOT_SUPPORTED_CODE = 1;
+const CSD_SCHEMA = "org.cinnamon.settings-daemon.plugins.power";
 
 const PANEL_EDIT_MODE_KEY = "panel-edit-mode";
 
@@ -256,7 +257,33 @@ class CinnamonPowerApplet extends Applet.TextIconApplet {
         this.brightness = new BrightnessSlider(this, _("Brightness"), "display-brightness", BrightnessBusName, 0);
         this.keyboard = new BrightnessSlider(this, _("Keyboard backlight"), "keyboard-brightness", KeyboardBusName, 0);
         this.menu.addMenuItem(this.brightness);
+
+        this._ambientItem = new PopupMenu.PopupSwitchMenuItem(_("Adjust automatically"), false);
+        this._ambientItem.actor.hide();
+        this.menu.addMenuItem(this._ambientItem);
+
+        this._brightnessSection = new PopupMenu.PopupSeparatorMenuItem();
+        this._brightnessSection.actor.hide();
+        this.menu.addMenuItem(this._brightnessSection);
+
         this.menu.addMenuItem(this.keyboard);
+        this._csdSettings = new Gio.Settings({ schema_id: CSD_SCHEMA });
+        this._ambientItem.setToggleState(this._csdSettings.get_boolean("ambient-enabled"));
+        this._ambientItem.connect("toggled", (item) => {
+            this._csdSettings.set_boolean("ambient-enabled", item.state);
+        });
+        this._csdSettings.connect("changed::ambient-enabled", () => {
+            this._ambientItem.setToggleState(this._csdSettings.get_boolean("ambient-enabled"));
+        });
+
+        this.keyboard.actor.connect("notify::visible", () => this._updateBrightnessSeparator());
+
+        Interfaces.getDBusProxyAsync(BrightnessBusName, (proxy, error) => {
+            if (error) return;
+            this._screenProxy = proxy;
+            this._updateAmbientVisibility();
+            this._screenProxy.connect("g-properties-changed", () => this._updateAmbientVisibility());
+        });
 
         try {
             // Hadess interface
@@ -340,6 +367,23 @@ class CinnamonPowerApplet extends Applet.TextIconApplet {
         this.set_show_label_in_vertical_panels(false);
     }
 
+    _updateAmbientVisibility() {
+        if (this._screenProxy && this._screenProxy.AmbientLightSupported) {
+            this._ambientItem.actor.show();
+        } else {
+            this._ambientItem.actor.hide();
+        }
+        this._updateBrightnessSeparator();
+    }
+
+    _updateBrightnessSeparator() {
+        if (this._ambientItem.actor.visible && this.keyboard.actor.visible) {
+            this._brightnessSection.actor.show();
+        } else {
+            this._brightnessSection.actor.hide();
+        }
+    }
+
     _onPanelEditModeChanged() {
         if (global.settings.get_boolean(PANEL_EDIT_MODE_KEY)) {
             if (!this.actor.visible) {

files/usr/share/cinnamon/cinnamon-settings/modules/cs_power.py

@@ -267,6 +267,13 @@ def on_module_selected(self):
             section = page.add_section(_("Screen brightness"))
             section.add_row(BrightnessSlider(section, proxy, _("Screen brightness")))
 
+            try:
+                ambient_supported = proxy.get_cached_property("AmbientLightSupported")
+                if ambient_supported is not None and ambient_supported.unpack():
+                    section.add_row(GSettingsSwitch(_("Adjust automatically"), CSD_SCHEMA, "ambient-enabled"))
+            except Exception as e:
+                print(f"Power module ambient light check failed: {e}")
+
             section.add_row(GSettingsSwitch(_("On battery, dim screen when inactive"), CSD_SCHEMA, "idle-dim-battery"))
 
             section.add_reveal_row(GSettingsComboBox(_("Brightness level when inactive"), CSD_SCHEMA, "idle-brightness", IDLE_BRIGHTNESS_OPTIONS, valtype=int, size_group=size_group), CSD_SCHEMA, "idle-dim-battery")

js/misc/interfaces.js

@@ -129,6 +129,7 @@ xml['org.cinnamon.SettingsDaemon.Power.Screen'] =
                 <arg type='u' name='new_percentage' direction='out'/> \
             </method> \
             <signal name='Changed'/> \
+            <property name='AmbientLightSupported' type='b' access='read'/> \
         </interface> \
     </node>",
     SETTINGS_DAEMON_POWER_NAME,