diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 6a034ec..63ee4e3 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -637,10 +637,16 @@
                                int mode) :
             mFlinger(flinger), mDisplay(disp) { mMode = mode; }
         virtual bool handler() {
+            Vector<DisplayInfo> configs;
+            mFlinger.getDisplayConfigs(mDisplay, &configs);
+            if(mMode < 0 || mMode >= configs.size()) {
+                ALOGE("Attempt to set active config = %d for display with %d configs",
+                        mMode, configs.size());
+            }
             sp<DisplayDevice> hw(mFlinger.getDisplayDevice(mDisplay));
             if (hw == NULL) {
                 ALOGE("Attempt to set active config = %d for null display %p",
-                        mDisplay.get(), mMode);
+                        mMode, mDisplay.get());
             } else if (hw->getDisplayType() >= DisplayDevice::DISPLAY_VIRTUAL) {
                 ALOGW("Attempt to set active config = %d for virtual display",
                         mMode);
@@ -2267,7 +2273,7 @@
             sp<DisplayDevice> hw(mFlinger.getDisplayDevice(mDisplay));
             if (hw == NULL) {
                 ALOGE("Attempt to set power mode = %d for null display %p",
-                        mDisplay.get(), mMode);
+                        mMode, mDisplay.get());
             } else if (hw->getDisplayType() >= DisplayDevice::DISPLAY_VIRTUAL) {
                 ALOGW("Attempt to set power mode = %d for virtual display",
                         mMode);