[crazygringo]

> just whenever any HDR encoded videos or EDR apps are open

Yup, I think this has to be the case. But the crazy thing is, I can't perceive any shift in UX brightness whatsoever, even a flicker, when I open/close an EDR video.

I would have thought that there would be some slight mismatch at the moment the backlight is brightened and pixels are darkened -- whether it would be a close but not perfect brightness match, or a flicker while they're not synced. But nothing.

As I mentioned in another comment, the only giveaway is that my cursor (mouse pointer) disappears for a second or two. I have to guess that adjusting its brightness happens at a different layer in the stack that can't be so precisely synced.

[skavi]

Yup, very impressive how well Apple has synced everything up. Definitely an advantage of controlling the whole stack.