MacBook Pro M3 Pro with Samsung Odyssey G9 OLED Smart

I had similar kind of issues: my M3 MacBook didn't identify the screen correctly and only offered a subset of the resolutions available. I decided to use BetterDisplay (https://github.com/waydabber/BetterDisplay) and manually set the display information, after which everything started working fine.

However, this is just an ugly workaround. There's definitely something wrong with M3 HDMI port/driver: I've tried several cables and none of them identify the display correctly. When using PIP (I'm using G9 with PIP, both HDMI + Display port connected to my M3 = 2x 2560x1440), I can't use the MacBooks HDMI port because of the previous issue. I'm using usb-c -> displayport & usb-c -> hdmi cables instead.

I have the same problem with my macbook m3 max, resolution on my samsung g9 49' is broken and I can set it only to 3840 x 2160 which looks low and weird, also 60hz is best i can do. I have no idea why its like that since its working on my second laptop with windows

Your MacBook Pro 16-in from 2022 or later supports HDMI 2.1, so it should work for HDMI displays up to 8K in size. That 5K display should not be an issue.

Whet has been vexing users at every turn is that cables "shipped in the box' tend to be 'lowest bidder' cables, just good enough to keep you from returning the device the same day.

Recent version of MacOS INSIST that data transmission to the display be completely error-free, or the resolution is reduced at the Mac end until it becomes pro free. HDMI 2.1 on a Mac that supports it requires CERTIFIED ULTRA cables.

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HDMI cables you want for HDMI-only Displays (higher resolutions than 720p TV sets) are marked as Certified with an anti-counterfeiting tag and are labeled:

"Premium High Speed HDMI cable" or that + "with Ethernet" --OR--

"Ultra High Speed HDMI cable" or that + "48G"

Cables with No Certification tags are good for your standard 720p TV set, and not much more.

HDMI was invented for HD TV sets. it works great at its original resolution of 720i or 720p. At higher resolutions, it quickly develops issues that are complex to solve, and the cables and adapters required to solve are NOT intuitive.

Additional information for the thread:

I am using the slightly older Samsung Odyssey 49in G9 5120x1440 @ 240hz which I bought in when the Macbook M1 came out because the Macbook M1 only supports 1 external display monitor.

This doesn't appear to be a cable issue nor monitor issue.

I have tried multiple branded cables from USB-C to DP and it will not detect the display on my 2023 Macbook M3 Pro. I have also tried a USB-C docking station to display ports using different cables directly plugged into it.

Nothing natively works other than HDMI to HDMI direct at a lower resolution capped out at 60hz for the M3 Pro. I have also factory reset the G9 and updated the firmware with not change in results.

Using the same USB-C to DP cables and/or docking stations, both my M1 and M2 MacBooks, Dell laptop and Personal PC and they detect the display and output the full 5120x1440 at 120 hz. I don't recall if it will put out 240 hz or not. I can check if this matters later.

If anyone finds a native fix please post.

devj_it--

Your postings have appeared on the Apple User-to-User Support Communities.

This is a great resource for getting and sharing ideas with other Users, but there is no there Apple following or Apple auditing of what is posted here. Apple is NOT working on a fix, and will not be unless/until you deliberately let them know there is a problem.

The level of documentation required for for Engineers to take this up is surprisingly large and complete. You need to provide enough information so that, if they had comparable equipment on hand, they could reproduce the issue in their labs.

If reproducing this issue requires this EXACT equipment, they would throw this back to you as "third party equipment defect, not an Apple Problem".

You should also consider pursing these issues with the display-maker.

Official Apple Support

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The problem back again to me, i have very poor, macbook pro m3 max + samsung odysey g9 5k2k

here i have 5k2k 60hz, if if go 120hz/hdr it will not work, on my windows laptop (much much much worse) it works perfectly fine.

Apple M3 Max 14” Nov 2023 16 core CPU, 40 core GPU

Not exactly the same setup but with a 2021 intel pro and a Neo G9 I can only reach full resolution with the DP port.

There are some similar cases on Reddit.

I came to this thread hoping to find this fixed in theM3, but i'd better wait for Sammy to release a G9 with two DP (the spare one goes to my gaming setup)

I attempted using BetterDisplay and the latest cable supporting up to 8K resolution (DisplayPort 1.4 to Thunderbolt 4), but it failed to work. Despite everything functioning correctly a month ago, I cannot recall any changes made since then. I haven't adjusted any settings or installed new applications during this period.

<<. (DisplayPort 1.4 to Thunderbolt 4). >>

what cable is that, exactly? Both Thunderbolt and DisplayPort have limited lengths for maximum display data speeds.

how long is the ThunderBolt portion of the cable before the adapter circuitry? how long is the portion of the cable between the adapter circuitry and the display?

Im not sure how did I resolved this problem, but it’s working now

I did update my system because there were some minor updates available and I restarted laptop and plug this cable:

1.8m DisplayPort-thunderbolt

https://allegro.pl/oferta/kabel-mac-macbook-usb-c-displayport-8k-5k-4k-240hz-10657757168

also this cable goes not directly to laptop but to dell dock station.

everything is working right now but

i can make 4K @ 240Hz

and 5k2k at maximum 120Hz

so I’m not sure if this is limitation of m3 max

on the Reddit I read that someone with cable UHBR13.5 can handle 7k tv with rx7000

https://www.reddit.com/r/ultrawidemasterrace/s/uHKQ8Twlkt

The typical limitation is that Dell docks do not tend to support high-end displays at full resolution on a Mac.

You are dealing with data rates that are faster and more un-relenting than any other signals in your Mac except the path processor to RAM memory. Any less than top-performing items in the chain will yield less-that-top resolutions.

Please specify EXACTLY how the connection goes from your Mac (what cable, how long) to the Dell dock (what Model Dell dock, what cable, how long) to the display.

I got my G9 OLED today and I am experiencing same issues as above: With HDMI 2.1 the highest option I get is 3840x2160 60hz which is very wrong as the display doesn’t even support x2160. Even when I choose 3840x1440 it still won’t go higher than 60hz. However when I try my dp-usb C cable I get the expected values 5120x1440 with 240hz and even HDR, BUT with the flickering.

My HDMI cable is a Nördic Certified Ultra High Speed HDMI 2.1 48gbps and I have confirmed there’s nothing wrong with it by trying it on different monitors and computers. In fact I used it with the same macbook on my previous Samsung G9 Neo monitor and was able to get 5120x1440p 120hz HDR (still surprised it didn’t go as high as 240hz since I now get it with a usb c to dp cable which has less bandwidth)