[gnome-settings-daemon/wip/hadess/force-screensaver-power-saver: 1/2] power: Dim screen faster if power saver mode is on

[Bastien Nocera <hadess src gnome org>]

commit 4b027055bddcd5a5cf5306a0828f8710f4ca3e96
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Jul 28 16:40:24 2021 +0200

    power: Dim screen faster if power saver mode is on
    
    As done on other platforms, aggressively dim the screen after a
    short period when the user has selected to enter power saver mode.
    
    Idle inhibitions are obviously still respected.
    
    Prior art:
    https://support.apple.com/en-us/HT205234

 plugins/power/gsd-power-manager.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)
---
diff --git a/plugins/power/gsd-power-manager.c b/plugins/power/gsd-power-manager.c
index 1f125a6f..cf6f5a57 100644
--- a/plugins/power/gsd-power-manager.c
+++ b/plugins/power/gsd-power-manager.c
@@ -192,6 +192,7 @@ struct _GsdPowerManager
         /* Power Profiles */
         GDBusProxy              *power_profiles_proxy;
         guint32                  power_saver_cookie;
+        gboolean                 power_saver_enabled;
 
         /* Sound */
         guint32                  critical_alert_timeout_id;
@@ -1903,7 +1904,8 @@ idle_configure (GsdPowerManager *manager)
                 /* Don't dim when the screen lock is active */
         } else if (!on_battery) {
                 /* Don't dim when charging */
-        } else if (manager->battery_is_low) {
+        } else if (manager->battery_is_low ||
+                   manager->power_saver_enabled) {
                 /* Aggressively blank when battery is low */
                 timeout_dim = SCREENSAVER_TIMEOUT_BLANK;
         } else {
@@ -2165,6 +2167,30 @@ power_profiles_proxy_signal_cb (GDBusProxy  *proxy,
         manager->power_saver_cookie = 0;
 }
 
+static void
+power_profiles_proxy_properties_changed_cb (GDBusProxy *proxy,
+                                            GVariant   *changed_properties,
+                                            GStrv       invalidated_properties,
+                                            gpointer    user_data)
+{
+        GsdPowerManager *manager = user_data;
+        g_autoptr(GVariant) v = NULL;
+        const char *active_profile;
+        gboolean power_saver_enabled;
+
+        if (!changed_properties)
+                return;
+        v = g_dbus_proxy_get_cached_property (proxy, "ActiveProfile");
+        if (!v)
+                return;
+        active_profile = g_variant_get_string (v, NULL);
+        power_saver_enabled = g_strcmp0 (active_profile, "power-saver") == 0;
+        if (power_saver_enabled != manager->power_saver_enabled) {
+                manager->power_saver_enabled = power_saver_enabled;
+                idle_configure (manager);
+        }
+}
+
 static void
 power_profiles_proxy_ready_cb (GObject             *source_object,
                               GAsyncResult        *res,
@@ -2179,6 +2205,9 @@ power_profiles_proxy_ready_cb (GObject             *source_object,
                 return;
         }
 
+        g_signal_connect (manager->power_profiles_proxy, "g-properties-changed",
+                          G_CALLBACK (power_profiles_proxy_properties_changed_cb),
+                          manager);
         g_signal_connect (manager->power_profiles_proxy, "g-signal",
                           G_CALLBACK (power_profiles_proxy_signal_cb),
                           manager);