diff --git a/services/surfaceflinger/DisplayHardware/DisplayHardwareBase.cpp b/services/surfaceflinger/DisplayHardware/DisplayHardwareBase.cpp
index 0c7e665..9c72812 100644
--- a/services/surfaceflinger/DisplayHardware/DisplayHardwareBase.cpp
+++ b/services/surfaceflinger/DisplayHardware/DisplayHardwareBase.cpp
@@ -72,8 +72,10 @@ bool DisplayHardwareBase::DisplayEventThread::threadLoop()
     int fd;
 
     fd = open(kSleepFileName, O_RDONLY, 0);
-    if (fd == -1 && errno == ENOENT)
+    if (fd == -1 && errno == ENOENT) {
+        usleep(166667); // Sleep to avoid 100% CPU usage.
         return true; // End silently if FB_EARLYSUSPEND appears to be missing, as on kernels >= 3.3
+    }
     do {
       err = read(fd, &buf, 1);
     } while (err < 0 && errno == EINTR);