Bug: No HDR available in Macbook Pro M1 Max 26.4

[wu-shixin]

The max brightness is maxed at 400 nits, worked fine on 26.2. Tried restarting laptop and reinstalling, didnt work.

[waydabber]

Make sure you are on the P3-1600 preset, have software image adjustment and combined brightness enabled for the display - then you should have a "Brightness Upscaling" option in the app menu.

Alternatively you can update to the latest internal pre-release version of the app and enable the experimental "Direct upscaling" under the display and enable upscaling in the app menu.

More info on why native upscaling is gone when you upgrade to 26.3 or newer: #4983