Hi, as noted in the cover letter, I think the connection to DRM is a red herring. The Display off callback in Windows is always called 5 seconds after the screen turns off due to inactivity or instantly if the user presses the power button. Likewise, Display on is called when the display is about to turn on. In fact, pressing the powerbutton in Windows no longer suspends the device. It just locks the session and turns off the screen. Then Windows can do whatever it wants for however long it wants before suspending the device. It took me 2 days to realise this, as my dev unit was updating and it stayed happily on for 10-20 minutes after pressing the power button when connected to a charger. I think "Screen Off" is what Microsoft decided to call their background wakelock state (as it is called in Android). That means that if there is ever a laptop with an Always On display, it will be on the "Screen Off" state while the screen is on. Antheas
