Can't enable native XDR brightness upscaling on 3.5.6b with macOS 26.3+

[radubortan]

Macbook Pro 14inch M4 Pro
MacOS 26.3.1
Version 3.5.6b Build 40871

Hi, I have noticed that I cannot use the extra brightness anymore, it stops at 600nits. In the settings I saw that Enable native XDR brightness upscaling is toggled off. When I click to toggle it on, the toggle doesn't move and I see some text appear under it for a split section before disappearing.

I have screen recorded my screen and this is the best frame I could find.

I don't remember modifying anything in my display settings since the last time the XDR brightness worked, so I'm not sure what it means with Apple Display Preset.
When I go in the Apple Display Preset in the menu and select the BetterDisplay XDR, it selects it for a second and then goes back to the P3-1600nits one).

[radubortan]

I have toggled Combined brightness under Video Control Settings and now I seem to be able to go up to 1600nits but I now get flickering around text and images while scrolling.

[waydabber]

Hi there - If you updated to macOS 26.3+, native upscaling no longer works (and also, Apple Presets partially work). Make sure you are running the latest app version.

#4983

There is an experimental "Direct upscaling" as well in the latest internal pre-release.

#5242