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OS: MacOS Sequoia 15.3.2 I'm using the native upscaling brightness function. I noticed that it reaches full brightness when the slider is at 93%. If you slowly pull the slider past 93% the brightness actually decreases and then starts increasing as you go up to 100%. So the brightness is actually the same at 93% and 100%. This also causes a visible flicker when using the keyboard brightness keys to go from 94% to 100% (that is the pre-determined step). This is with TrueTone disabled. Interestingly, with TrueTone enabled, the same thing seems to happen at around 90% on the slider, and the flicker occurs between the 87% and 94% steps when using the keyboard keys. |
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Replies: 1 comment 2 replies
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This is because the slider adjusts the peak brightness, not actual brightness. The actual brightness depends on various factors. If you have a predominantly bright screen with all LEDs at full, the panel will hit a power treshold and the system will limit the brightness. However if you have for example a dark screen or a 10% bright window, the effect will be carried to the full 1600nits for that smaller region. Night shift adjusts white balance and lowers luminosity, that's why the power limit reached at a higher limit. If you mostly use bright scenes and you find the behavior annoying, you can simply limit the max nits to 1400 in native upscaling settings. |
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Thanks for the explanation, but I'm not quite sure I understand. If I'm slowly dragging the slider and the screen as a whole gets brighter and brighter to 93%, why would it then drop down in brightness (power limit?), but then start going up in brightness again as you continue dragging to 100%? And this power limit point is actually hit sooner not later with night shift on (90% vs 93%). You're right about this not happening on darker content! |
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Not sure, the power limit differs by model, panel manufacture and depends on various transient factors as well. The main thing it's not the app's doing - if you want to avoid it all times, you can try setting the limit to 1300-1400 nits but that will prevent 1600 nits on small window. The panel is rated for 1000 nits sustained full screen white brightness, so anything above that is subject to various limits/protections. |
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This is because the slider adjusts the peak brightness, not actual brightness. The actual brightness depends on various factors. If you have a predominantly bright screen with all LEDs at full, the panel will hit a power treshold and the system will limit the brightness. However if you have for example a dark screen or a 10% bright window, the effect will be carried to the full 1600nits for that smaller region. Night shift adjusts white balance and lowers luminosity, that's why the power limit reached at a higher limit.
If you mostly use bright scenes and you find the behavior annoying, you can simply limit the max nits to 1400 in native upscaling settings.