Fix auto-brightness with gnome-shell 49.x

Related: https://issues.redhat.com/browse/RHEL-144940

0001-power-Trigger-re-normalization-on-out-of-band-bright.patch

@@ -0,0 +1,98 @@
+From d1507341dab832e78ba4d6961f8cd24ee265023f Mon Sep 17 00:00:00 2001
+From: Carlos Garnacho <carlosg@gnome.org>
+Date: Mon, 24 Nov 2025 17:19:45 +0100
+Subject: [PATCH] power: Trigger re-normalization on out-of-band brightness
+ changes
+
+When brightness is auto-managed by ALS, we still have two situations
+where the brightness changes do not come from it:
+
+- User changes to the display brightness, either through keybindings,
+  or the sliders in the shell menu being changed.
+- Dimming requests on user inactivity.
+
+The response to both should be similar, the abrupt brightness change
+can alter ALS readings, so the brightness resulting of the change must
+be used as a new baseline for normalization.
+
+Tracking of user-triggered changes is done through a new BrightnessChanged
+signal in the org.gnome.Shell.Brightness D-Bus interface. This will do
+nothing on older versions of GNOME Shell without the signal, so effectively
+brightness changes would not trigger a re-normalization there, as before.
+If the signal exists and is emitted, then it will be used.
+
+(cherry picked from commit 5af04e7742701849e4f1ac04b340a3acf3a3345f)
+---
+ plugins/power/gsd-power-manager.c | 27 +++++++++++++++++++++------
+ 1 file changed, 21 insertions(+), 6 deletions(-)
+
+diff --git a/plugins/power/gsd-power-manager.c b/plugins/power/gsd-power-manager.c
+index b7b5b642..bfbf0071 100644
+--- a/plugins/power/gsd-power-manager.c
++++ b/plugins/power/gsd-power-manager.c
+@@ -1237,19 +1237,19 @@ shell_brightness_set_dimming_cb (GObject      *source_object,
+                                  GAsyncResult *res,
+                                  gpointer      user_data)
+ {
++        GsdPowerManager *manager = user_data;
+         g_autoptr (GVariant) result = NULL;
+         g_autoptr (GError) error = NULL;
+-        gboolean enable = !!GPOINTER_TO_UINT (user_data);
+ 
+         result = g_dbus_proxy_call_finish (G_DBUS_PROXY (source_object),
+                                            res,
+                                            &error);
+-        if (result)
++        if (result) {
++                manager->ambient_norm_required = TRUE;
+                 return;
++        }
+ 
+-        g_warning ("couldn't %s dimming: %s",
+-                   enable ? "enable" : "disable",
+-                   error->message);
++        g_warning ("couldn't change dimming: %s", error->message);
+ }
+ 
+ static void
+@@ -1265,7 +1265,7 @@ shell_brightness_set_dimming (GsdPowerManager *manager,
+                            G_DBUS_CALL_FLAGS_NONE,
+                            -1, NULL,
+                            shell_brightness_set_dimming_cb,
+-                           GUINT_TO_POINTER (enable));
++                           manager);
+ }
+ 
+ static void
+@@ -2987,6 +2987,16 @@ iio_proxy_vanished_cb (GDBusConnection *connection,
+         g_clear_object (&manager->iio_proxy);
+ }
+ 
++static void
++on_brightness_changed_by_user (GsdPowerManager *manager)
++{
++        /* Brightness was changed by the user, we need a new baseline
++         * for the normalization being applied.
++         */
++        g_debug ("User brightness change detected, re-normalizing");
++        manager->ambient_norm_required = TRUE;
++}
++
+ gboolean
+ gsd_power_manager_start (GsdPowerManager *manager,
+                          GError **error)
+@@ -3132,6 +3142,11 @@ gsd_power_manager_start (GsdPowerManager *manager,
+                 g_clear_error (error);
+         }
+ 
++        g_signal_connect_swapped (manager->shell_brightness_proxy,
++                                  "g-signal::BrightnessChanged",
++                                  G_CALLBACK (on_brightness_changed_by_user),
++                                  manager);
++
+         manager->devices_array = g_ptr_array_new_with_free_func (g_object_unref);
+         manager->devices_notified_ht = g_hash_table_new_full (g_str_hash, g_str_equal,
+                                                               g_free, NULL);
+-- 
+2.52.0
+

gnome-settings-daemon.spec

@@ -40,6 +40,9 @@ Patch2: subman-delay-startup-notification-by-30min.patch
 # https://issues.redhat.com/browse/RHEL-124242
 Patch3: use-shell-brightness.patch
 
+# https://issues.redhat.com/browse/RHEL-144940
+Patch4: 0001-power-Trigger-re-normalization-on-out-of-band-bright.patch
+
 BuildRequires:  gcc
 BuildRequires:  gettext
 BuildRequires:  meson >= 0.49.0