Save A Battery - Disable Video on Portable Devices

There are many times I’m on a long plane flight and want to go to sleep listening to my favorite movies. This would be much better if I didn’t wake up to a dead battery…

Is it possible to add a “turn off screen” button so we can listen to a movie but save battery time by not illuminating the screen?

Thanks

duplicate feature request

closing

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Early 2021 clean-up: duplicate