diff --git a/suspend/1.0/default/SystemSuspend.cpp b/suspend/1.0/default/SystemSuspend.cpp
index 4245a05..c5c83c7 100644
--- a/suspend/1.0/default/SystemSuspend.cpp
+++ b/suspend/1.0/default/SystemSuspend.cpp
@@ -19,20 +19,27 @@
 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/properties.h>
+#include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <fcntl.h>
 #include <hidl/Status.h>
 #include <hwbinder/IPCThreadState.h>
+
+#include <linux/uinput.h>
+#include <dirent.h>
+#include <poll.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 
 #include <string>
 #include <thread>
 
+using ::android::base::GetBoolProperty;
 using ::android::base::GetProperty;
 using ::android::base::Error;
 using ::android::base::ReadFdToString;
 using ::android::base::WriteStringToFd;
+using ::android::base::StringPrintf;
 using ::android::hardware::Void;
 using ::std::string;
 
@@ -47,6 +54,146 @@
 static constexpr char kSysPowerWakeLock[] = "/sys/power/wake_lock";
 static constexpr char kSysPowerWakeUnlock[] = "/sys/power/wake_unlock";
 
+class PowerbtndThread {
+   public:
+    PowerbtndThread();
+    void sendKeyPower(bool longpress);
+    void sendKeyWakeup();
+
+   private:
+    void emitKey(int key_code, int val);
+    void run();
+    unique_fd mUinputFd;
+};
+
+PowerbtndThread::PowerbtndThread()
+    : mUinputFd(open("/dev/uinput", O_WRONLY | O_NDELAY))
+{
+    if (mUinputFd < 0) {
+        LOG(ERROR) << "could not open uinput device: " << strerror(errno);
+        return;
+    }
+
+    struct uinput_user_dev ud;
+    memset(&ud, 0, sizeof(ud));
+    strcpy(ud.name, "Android Power Button");
+    write(mUinputFd, &ud, sizeof(ud));
+    ioctl(mUinputFd, UI_SET_EVBIT, EV_KEY);
+    ioctl(mUinputFd, UI_SET_KEYBIT, KEY_POWER);
+    ioctl(mUinputFd, UI_SET_KEYBIT, KEY_WAKEUP);
+    ioctl(mUinputFd, UI_DEV_CREATE, 0);
+
+    std::thread([this] { run(); }).detach();
+    LOG(INFO) << "automatic system suspend enabled";
+}
+
+void PowerbtndThread::sendKeyPower(bool longpress)
+{
+    emitKey(KEY_POWER, 1);
+    if (longpress) sleep(2);
+    emitKey(KEY_POWER, 0);
+}
+
+void PowerbtndThread::sendKeyWakeup()
+{
+    emitKey(KEY_WAKEUP, 1);
+    emitKey(KEY_WAKEUP, 0);
+}
+
+void PowerbtndThread::emitKey(int key_code, int val)
+{
+    struct input_event iev;
+    iev.type = EV_KEY;
+    iev.code = key_code;
+    iev.value = val;
+    iev.time.tv_sec = 0;
+    iev.time.tv_usec = 0;
+    write(mUinputFd, &iev, sizeof(iev));
+    iev.type = EV_SYN;
+    iev.code = SYN_REPORT;
+    iev.value = 0;
+    write(mUinputFd, &iev, sizeof(iev));
+    LOG(INFO) << StringPrintf("send key %d (%d) on fd %d", key_code, val, mUinputFd.get());
+}
+
+void PowerbtndThread::run()
+{
+    int cnt = 0, timeout = -1, pollres;
+    bool longpress = true;
+    bool doubleclick = GetBoolProperty("poweroff.doubleclick", false);
+    struct pollfd pfds[3];
+    const char *dirname = "/dev/input";
+
+    if (DIR *dir = opendir(dirname)) {
+        struct dirent *de;
+        while ((cnt < 3) && (de = readdir(dir))) {
+            int fd;
+            char name[PATH_MAX];
+            if (de->d_name[0] != 'e') /* eventX */
+                continue;
+            snprintf(name, PATH_MAX, "%s/%s", dirname, de->d_name);
+            fd = open(name, O_RDWR | O_NONBLOCK);
+            if (fd < 0) {
+                LOG(ERROR) << StringPrintf("could not open %s, %s", name, strerror(errno));
+                continue;
+            }
+            name[sizeof(name) - 1] = '\0';
+            if (ioctl(fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1) {
+                LOG(ERROR) << StringPrintf("could not get device name for %s, %s", name, strerror(errno));
+                name[0] = '\0';
+            }
+            // TODO: parse /etc/excluded-input-devices.xml
+            if (strcmp(name, "Power Button")) {
+                close(fd);
+                continue;
+            }
+
+            LOG(INFO) << StringPrintf("open %s(%s) ok fd=%d", de->d_name, name, fd);
+            pfds[cnt].events = POLLIN;
+            pfds[cnt++].fd = fd;
+        }
+        closedir(dir);
+    }
+
+    while (cnt > 0) {
+        if ((pollres = poll(pfds, cnt, timeout)) < 0) {
+            LOG(ERROR) << "poll error: " << strerror(errno);
+            break;
+        }
+        LOG(VERBOSE) << "pollres=" << pollres << " timeout=" << timeout;
+        if (pollres == 0) {
+            LOG(INFO) << "timeout, send one power key";
+            sendKeyPower(0);
+            timeout = -1;
+            longpress = true;
+            continue;
+        }
+        for (int i = 0; i < cnt; ++i) {
+            if (pfds[i].revents & POLLIN) {
+                struct input_event iev;
+                size_t res = read(pfds[i].fd, &iev, sizeof(iev));
+                if (res < sizeof(iev)) {
+                    LOG(WARNING) << StringPrintf("insufficient input data(%zd)? fd=%d", res, pfds[i].fd);
+                    continue;
+                }
+                LOG(DEBUG) << StringPrintf("type=%d code=%d value=%d from fd=%d", iev.type, iev.code, iev.value, pfds[i].fd);
+                if (iev.type == EV_KEY && iev.code == KEY_POWER && !iev.value) {
+                    if (!doubleclick || timeout > 0) {
+                        sendKeyPower(longpress);
+                        timeout = -1;
+                    } else {
+                        timeout = 1000; // one second
+                    }
+                } else if (iev.type == EV_SYN && iev.code == SYN_REPORT && iev.value) {
+                    LOG(INFO) << "got a resuming event";
+                    longpress = false;
+                    timeout = 1000; // one second
+                }
+            }
+        }
+    }
+}
+
 // This function assumes that data in fd is small enough that it can be read in one go.
 // We use this function instead of the ones available in libbase because it doesn't block
 // indefinitely when reading from socket streams which are used for testing.
@@ -90,6 +237,7 @@
     : mSuspendCounter(0),
       mWakeupCountFd(std::move(wakeupCountFd)),
       mStateFd(std::move(stateFd)),
+      mPwrbtnd(new PowerbtndThread()),
       mSuspendStatsFd(std::move(suspendStatsFd)),
       mBaseSleepTime(baseSleepTime),
       mSleepTime(baseSleepTime),
@@ -199,6 +347,8 @@
 
             if (!success) {
                 PLOG(VERBOSE) << "error writing to /sys/power/state";
+            } else {
+                mPwrbtnd->sendKeyWakeup();
             }
 
             mControlService->notifyWakeup(success);
diff --git a/suspend/1.0/default/SystemSuspend.h b/suspend/1.0/default/SystemSuspend.h
index 83121b5..ec1d862 100644
--- a/suspend/1.0/default/SystemSuspend.h
+++ b/suspend/1.0/default/SystemSuspend.h
@@ -42,6 +42,7 @@
 
 using namespace std::chrono_literals;
 
+class PowerbtndThread;
 class SystemSuspend;
 
 struct SuspendStats {
@@ -105,6 +106,7 @@
     unique_fd mWakeupCountFd;
     unique_fd mStateFd;
     std::string mSleepState;
+    PowerbtndThread *mPwrbtnd;
 
     unique_fd mSuspendStatsFd;
 
diff --git a/suspend/1.0/default/android.system.suspend@1.0-service.rc b/suspend/1.0/default/android.system.suspend@1.0-service.rc
index c5d3869..f353302 100644
--- a/suspend/1.0/default/android.system.suspend@1.0-service.rc
+++ b/suspend/1.0/default/android.system.suspend@1.0-service.rc
@@ -1,5 +1,5 @@
 service system_suspend /system/bin/hw/android.system.suspend@1.0-service
     class hal
     user system
-    group system wakelock
+    group system wakelock uhid input
     capabilities BLOCK_SUSPEND