Is your dim timeout 2 minutes? The dim timeout begins when you press the lock button but won't dim until at least 60 seconds after the last blanking pause signal. I could probably read the dim timeout and adjust the message if greater than 60 seconds. Lock&blank and blank will not override the blanking pause either and result in the same notification. Wouldn't a long press on the power button shutdown your device? What is your timeout from dim to blank? Power button will dim the screen if another key is required to unlock, but if your dim->blank timeout was near zero it might cause problems. If the screen is off and locked then power button requires another key to unlock or none if you prefer the old way, you can change it in the settings. If the screen is locked and has dimmed then power button will blank the screen. It is important that is has dimmed because MCE will dim it after power button has blanked the screen causing it to turn back on.