Merge "Send display-OFF event if that is initial state." into sc-dev am: 7fe46bae14

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13583070

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I76425dd254ad0ef71338efe29d1bd8b36dbcd87d

services/core/java/com/android/server/display/LocalDisplayAdapter.java

@@ -718,7 +718,12 @@ final class LocalDisplayAdapter extends DisplayAdapter {
                                 setDisplayState(Display.STATE_ON);
                                 currentState = Display.STATE_ON;
                             } else {
-                                return; // old state and new state is off
+                                if (oldState == Display.STATE_UNKNOWN) {
+                                    // There's no guarantee about what the initial state is
+                                    // at startup, so we have to set it if previous was UNKNOWN.
+                                    setDisplayState(state);
+                                }
+                                return;
                             }
                         }