native: Invalidate CRTC gamma when resuming or leaving power save

With atomic mode setting, commits don't work when CRTCs aren't enabled,
which they aren't when we're power saving. This means the gamma state
fails to being update. To fix night light and for whatever other reason
gamma ramps was changed during power saving by marking the CRTC gamma
state as invalid when leaving power saving, as well as when resuming.
This means that the next frame will append the CRTC gamma state to the
KMS commit.

Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1755
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1835>

src/backends/native/meta-monitor-manager-native.c

@@ -153,21 +153,24 @@ meta_monitor_manager_native_set_power_save_mode (MetaMonitorManager *manager,
   MetaKms *kms = meta_backend_native_get_kms (backend_native);
   GList *l;
 
+  for (l = meta_backend_get_gpus (backend); l; l = l->next)
+    {
+      MetaGpuKms *gpu_kms = l->data;
+
       switch (mode)
         {
         case META_POWER_SAVE_ON:
         case META_POWER_SAVE_UNSUPPORTED:
-      /* This will be handled on mode set. */
+          {
-      return;
+            g_list_foreach (meta_gpu_get_crtcs (META_GPU (gpu_kms)),
+                            (GFunc) meta_crtc_kms_invalidate_gamma,
+                            NULL);
+            break;
+          }
         case META_POWER_SAVE_STANDBY:
         case META_POWER_SAVE_SUSPEND:
         case META_POWER_SAVE_OFF:
-      break;
-    }
-
-  for (l = meta_backend_get_gpus (backend); l; l = l->next)
           {
-      MetaGpuKms *gpu_kms = l->data;
             MetaKmsDevice *kms_device = meta_gpu_kms_get_kms_device (gpu_kms);
             MetaKmsUpdate *kms_update;
             MetaKmsUpdateFlag flags;
@@ -186,6 +189,9 @@ meta_monitor_manager_native_set_power_save_mode (MetaMonitorManager *manager,
                 g_warning ("Failed to enter power saving mode: %s",
                            meta_kms_feedback_get_error (kms_feedback)->message);
               }
+            break;
+          }
+        }
     }
 }
 
@@ -540,7 +546,20 @@ meta_monitor_manager_native_pause (MetaMonitorManagerNative *manager_native)
 void
 meta_monitor_manager_native_resume (MetaMonitorManagerNative *manager_native)
 {
+  MetaMonitorManager *manager = META_MONITOR_MANAGER (manager_native);
+  MetaBackend *backend = meta_monitor_manager_get_backend (manager);
+  GList *l;
+
   meta_monitor_manager_native_connect_hotplug_handler (manager_native);
+
+  for (l = meta_backend_get_gpus (backend); l; l = l->next)
+    {
+      MetaGpu *gpu = l->data;
+
+      g_list_foreach (meta_gpu_get_crtcs (gpu),
+                      (GFunc) meta_crtc_kms_invalidate_gamma,
+                      NULL);
+    }
 }
 
 static gboolean

src/backends/native/meta-renderer-native.c

@@ -1167,7 +1167,12 @@ meta_renderer_native_prepare_frame (MetaRendererNative *renderer_native,
                                     MetaRendererView   *view,
                                     ClutterFrame       *frame)
 {
+  MetaRenderer *renderer = META_RENDERER (renderer_native);
+  MetaBackend *backend = meta_renderer_get_backend (renderer);
+  MetaMonitorManager *monitor_manager =
+    meta_backend_get_monitor_manager (backend);
   MetaCrtc *crtc = meta_renderer_view_get_crtc (view);
+  MetaPowerSave power_save_mode;
   MetaCrtcKms *crtc_kms;
   MetaKmsCrtc *kms_crtc;
   MetaKmsDevice *kms_device;
@@ -1175,6 +1180,10 @@ meta_renderer_native_prepare_frame (MetaRendererNative *renderer_native,
   if (!META_IS_CRTC_KMS (crtc))
     return;
 
+  power_save_mode = meta_monitor_manager_get_power_save_mode (monitor_manager);
+  if (power_save_mode != META_POWER_SAVE_ON)
+    return;
+
   crtc_kms = META_CRTC_KMS (crtc);
   kms_crtc = meta_crtc_kms_get_kms_crtc (META_CRTC_KMS (crtc));
   kms_device = meta_kms_crtc_get_device (kms_crtc);