I've submitted multiple bug reports to Philips and talked directly to the design engineers at that past 2 CEDIA tradeshows about this exact issue. There is no hard button backlight activation from either the tilt sensor or button/screen presses.

This is a huge oversight seeing as how the feature is included in older Pronto models as well as newer Marantz models. Several firmware revisions have been released since my numerous complaints and I'm still waiting for that feature. It makes me want to abandon Philips products because each new generation is two steps forward and one step back.