This new ability, as spotted by Android Authority, allows supported Pixel phones to stop charging the battery when it hits 80%, but continue to use power from a plug to power the phone. At least, that’s what seems to be happening based on tests
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You can spin the pinhole up in a docker image and have it run as a secondary DNS server. The rest of your network can use the existing DNS and only point the TV at the pi. If you sit down to watch something and it requires tweaking, just flick back to regular DNS :)