diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index bd3f156..fb0c712 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -5007,7 +5007,7 @@
     }
     // Numbers from 1000 to 1034 are currently used for backdoors. The code
     // in onTransact verifies that the user is root, and has access to use SF.
-    if (code >= 1000 && code <= 1034) {
+    if (code >= 1000 && code <= 1035) {
         ALOGV("Accessing SurfaceFlinger through backdoor code: %u", code);
         return OK;
     }
@@ -5330,6 +5330,19 @@
                 }
                 return NO_ERROR;
             }
+            case 1035: {
+                n = data.readInt32();
+                mDebugDisplayConfigSetByBackdoor = false;
+                if (n >= 0) {
+                    const auto displayToken = getInternalDisplayToken();
+                    status_t result = setAllowedDisplayConfigs(displayToken, {n});
+                    if (result != NO_ERROR) {
+                        return result;
+                    }
+                    mDebugDisplayConfigSetByBackdoor = true;
+                }
+                return NO_ERROR;
+            }
         }
     }
     return err;
@@ -5846,6 +5859,11 @@
         return BAD_VALUE;
     }
 
+    if (mDebugDisplayConfigSetByBackdoor) {
+        // ignore this request as config is overridden by backdoor
+        return NO_ERROR;
+    }
+
     postMessageSync(new LambdaMessage([&]() NO_THREAD_SAFETY_ANALYSIS {
         const auto display = getDisplayDeviceLocked(displayToken);
         if (!display) {