Android accelerometer not working when screen is turned off

I'm developing an application for my final thesis on computer science, and I need to collect and log accelerometer data. I need to acquire it for a whole day long, so there are serious battery constraints (for instance, I cannot leave the screen on). Also, this isn't a market targeted application, so it is pretty acceptable to do some serious hacking, even low level C/C++ coding, if required.

It is well known that on many devices the listeners for accelerometer events stop generating events when screen goes off (some links regarding this problem: http://code.google.com/p/android/issues/detail?id=3708 , Accelerometer stops delivering samples when the screen is off on Droid/Nexus One even with a WakeLock). I have thoroughly searched for some alternatives, some of them include workarounds that do not work for my device (LG P990, stock ROM).

So what happens is this: When you register an event listener for android accelerometer sensor in a Service, it works fine until the screen is turned off. I have already tried to register the eventListener on a Service, on an IntentService, tried to acquire WakeLocks. Regarding wakelocks, I can verify that the service is still running watching the LOGcat output, but it seems the accelerometer is put into sleep mode. One of the workarounds presented in some of the links is to unregister and re-register the event listener periodically using the thread of an IntentService like in this code snippet bellow

synchronized private static PowerManager.WakeLock getLock(Context context) {
    if (lockStatic==null) {
        PowerManager mgr=(PowerManager)context.getSystemService(Context.POWER_SERVICE);

        lockStatic = mgr.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,NAME);
        lock