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MediaPlayer disables playback too early on Lollipop when the screen is off

I am having a problem with MediaPlayer on Lollipop devices. Basically, when the device’s screen is off (that is, the user has locked the device), playback continues, but ends about 1 to 2 seconds too soon. This does not happen if the screen is on.

I have an onCompletionListener on MediaPlayer:

@Override
public void onCompletion(final MediaPlayer mediaPlayer) {
    int progress = mediaPlayer.getCurrentPosition();
    int duration = mediaPlayer.getDuration();
    Log.d("PlaybackController", "progress: " + progress + " duration: " + duration);
    Log.d("PlaybackController", "Delay: " + (duration - progress)); // I'm seeing a difference of 1 - 3 seconds :(.
    mServiceHandler.postDelayed(new Runnable() {
        @Override
        public void run() {
            broadcastCompleted();
        }
    }, Math.max(duration - progress, 0));
}

Usually it prints: Delay: [1500 - 3000]. I was wondering if there is a trace lock that I am missing, but I am doing the correct locks mentioned here: http://developer.android.com/guide/topics/media/mediaplayer.html , which include PARTIAL_WAKE_LOCK and WifiLock. Is there anything else I am missing?

+4
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: MediaPlayer :

playerToPrepare.setWakeMode(context, PowerManager.PARTIAL_WAKE_LOCK);

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SystemProperties.java , android.os (it JNI-, ).

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public void openDeveloperSettingsIfAwesomePlayerNotActivated(final Context context) {
    final boolean useAwesome = SystemProperties.getBoolean("persist.sys.media.use-awesome", false);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && !useAwesome) {
        final Intent intent = new Intent(Settings.ACTION_APPLICATION_DEVELOPMENT_SETTINGS);
        context.startActivity(intent);                
    }
}
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