The new Apple TV supports QMS VRR (Quick Media Switching, Variable Refresh Rate) so that when switching from one framerate to another (like 24 to 60Hz) there isn’t a screen blackout.
However, changing resolution or dynamic ranges, still result in blackouts. But why?
I’m thinking this is an HDMI limitation/issue, but why is this not a problem for iPhones or built in apps?
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How do you know the iphone is actually switching vs just rendering things to what it needs?
The screen blacks out on HDMI changes like those because there is a re-negotiation of the link between devices.