![]() ![]() It’s what allows you to daisy-chain DisplayPort monitors, or simply have multiple independent displays work through a single USB-C port. The issue more so comes up when you are trying to use multiple external monitors.ĭP MST is DisplayPort Multi-stream. This is such an odd limitation because the display should always receive 4K signal (5120x2880 downscaled to 3840x2160) so why would scaling matter? So it seems that as long as the framebuffer is 3840x2160, HDR is available, but at those fractional scaling levels it renders at e.g 5120x2880 and then high refresh rate no longer works for HDR. HDMI 2.1 is capable of 4K 144 Hz without DSC while DP 1.4 is limited to 4K 120 Hz. This seems to come down to Display Stream Support - which is nearly guaranteed to be broken unless using an Apple display. These are the results using Samsung G70A.ĮDIT 2: Added DP vs HDMI difference. The built-in display even switches scaling instantly without first resetting the display.ĮDIT: Investigated further. I can set it to any scaling level and HDR just works, even with an external displays connected. Meanwhile the built-in display on the Macbook Pro does not suffer from these issues. I can plug literally the same cables to my desktop PC and any scaling level gives me full 4K 120/144 Hz with 10-bit, 4:4:4 color and HDR! This is just mad behavior! You don't have this sort of issue on Windows at all where scaling is somehow tied to HDR support. Same deal if I set to native 3840x2160.īut if I instead scale to "looks like 2560x1440" or "looks like 3200x1800" then HDR toggle just disappears completely. If I set either of these 4K screens to 1:1 scaling or "looks like 1920x1080", HDR becomes available. What I found out was that scaling level has an effect on whether HDR works or not. I wanted to try HDR on this display as well as my LG CX 4K OLED TV (which of course has far superior HDR to the G70A). So I was excited to see that the HDMI port on my M2 Max could deliver 4K 144 Hz on my Samsung G70A, though it defaulted to 8-bit color despite the display being capable of 10-bit. I know this is not even consistent between display models as some work at 4K 120 Hz. On MacOS I would only get either a blank screen or have to use HDMI with the display limited to HDMI 2.0 specs. Plug same DP cable or adapter into a PC and 4K 144 Hz works, so 100% issue with Mac. 4K 144 Hz display only showing image at 4K 60 Hz.I received a Macbook Pro 16" M2 Max recently and hoped that this would finally solve the issues I had been having on a 2019 Intel model when using external displays. This subreddit is not endorsed or sponsored by Apple Inc. If you'd like to view their content together, click here. This fundamental difference in audience is why we support two communities, r/Apple and r/AppleHelp. Apple SubredditsĬontent which benefits the community (news, rumors, and discussions) is valued over content which benefits only the individual (technical questions, help buying/selling, rants, etc.). Not sure what to buy?Īsk in our Daily Advice Thread or in our dedicated sister sub /r/AppleWhatShouldIBuy! See also the iPhone Upgrade Wiki for more information. Comments that are spreading COVID vaccine misinformation/claims are not allowed.Ĭheck here to see if any Apple services are down.These belong in the beta subreddits listed below. The proper place for advice is /r/AppleWhatShouldIBuy. ![]() No posts or comments relating to buying, selling, trading, giveaways or asking for advice about any of those topics.No content related to piracy or illegal activities.Before posting, read the detailed rules here. Self-promotion is allowed on Sundays only, strictly reserved for app developers and must be in the form of a self-post. We may approve your post if it is a high-level issue that can't be found through searches, or if it affects a large amount of people. No support questions outside of the Daily Advice Thread.No posts that aren’t directly related to Apple or the Apple eco-system.No rude, offensive, or hateful comments.No editorialized link titles (use the original source's title if applicable).Posts must foster reasonable discussion.No memes, direct images or contextless image/video posts.If you have a tech or buying/selling-related question, please check out our Daily Advice Thread or r/AppleHelp! CommunityĪ more in-depth version of the rules can be found here Welcome to r/Apple, the unofficial community for Apple news, rumors, and discussions.
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