Samsung 57" 8k display resets resolutions on wake from sleep (Mac Mini M2 Pro)

I managed to resolve this completely by purchasing a USB C to DisplayPort 2.1 (40Gbps) cable

Now whenever the machine wakes, it correctly picks up the maximum resolution.

I strongly suspect use of an 8K HDMI 2.1 (48Gbps) cable will also solve the problem.

Good news! I've been able to get the display working flawlessly with the DisplayPort 2.1 (40Gbps) cable: no flickering and always wakes from sleep at the highest resolution (7680 x 2160).

It seems that when using the DisplayPort connection, the monitor is particularly sensitive to the power supply (which was not an issue when using HDMI)... so by having power for the monitor come through a surge protector it's resolved the issue completely.

I have this exact same issue with the 57" Samsung monitor on the Mac Mini M2 Pro.

If the machine has only been in a sleep state for a short period then the problem doesn't occur, but any longer than that and the monitor reverts to a lower resolution.

The only workaround is to use the PBP mode on the monitor, to set it up as two 4K displays side-by-side - then you get the full resolution every time. It's not quite as nice as it being driven as a single monitor (eg windows don't stay put on the correct part of the screen), but at least it always wakes from sleep with everything at the full resolution (and you don't need an M2 Pro to do this - you can use just the Mac Mini M1).

For this monitor specifically, I have found that switching the HDMI version in the monitor settings from 2.0+ to 1.4, and then back, fixes this when it happens. It's annoying, and I've ordered that cable to use it instead, but it's a little better than a complete reboot.

I am using the cable

USB C to DisplayPort 2.1 Cable... https://www.amazon.com/dp/B0CHFJXSNY?ref=ppx_pop_mob_ap_share

My monitor is plugged into an APC in a 220v environment, no flicker.. left my Mac alone for a week, came back and all good!

it will never happen but it needs to ship with DP, marketing will never allow it

hopefully Samsung FW improves over time

Yes, don't sleep your Mac. Leave it awake or power it down instead. Others have asked the same question and sleep seems to be the common denominator. There is no workaround that I know of right now.

Hi... an update on this.

It's true that a USB C to DisplayPort 2.1 (40Gbps) cable has fixed the problem with the monitor correctly picking up the resolution every time after sleep... however, I've found that with that cable the screen can flicker intermittently.

Sometimes it's absolutely perfect for five or ten minutes, and then there's the odd flicker for an instant on one quarter of the screen (which is far from perfect, but which I could probably live for a while)... but other times the flicker can be multiple times in a few seconds, and quite extreme (screen going black for a second or so) which is terrible.

So, I've ordered an 8K HDMI 2.1 (48Gbps) cable to see if that fixes both issues (I never see any flickering over HDMI), and I should be able to provide an update tomorrow.

I'm in the same boat. Brand new Mac Studio Max, amazing monitor but you have to turn off letting the monitor sleep.

My Dell monitors of 10 years work just fine.. switch over to this monitor and boom. I'm really curious who's to blame for this and if it will actually get resolved.

Sorry, I (just) noticed that I originally (two weeks ago) posted a link to the wrong cable... here's the correct link to the USB-C to DisplayPort 2.1 cable:

https://www.amazon.com/gp/product/B0CHFKKN6F/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

Take a look at this discussion thread.

https://discussions.apple.com/thread/253231297

Ah, yes my apologies - that was the wrong link!

This is the USB-C to DisplayPort 2.1 cable:

https://www.amazon.com/gp/product/B0CHFKKN6F/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

This is the DisplayPort 2.1 cable:

https://www.amazon.com/gp/product/B0BTYRWR47/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&th=1

I actually bought the 6ft version, but I might try the 3ft version to see if that makes a difference to the flickering I've seen.

Hi, the M2 Mac mini Technical Specifications page shows that the M2 Pro version supports "One display with up to 8K resolution at 60Hz" (although it seems to suggest it only does that over HDMI, when in fact it does it over Thunderbolt also).

I happen to have an M1 Pro MacBook to hand, and I just tried it with the 57" display, on both Thunderbolt and HDMI, and unfortunately the MacBook does not drive the display at the full resolution on either port (it only allows you to select a maximum of 5120 x 1140).

There is utility for Mac OS called "Stay" which is specifically built for this fixing the issue with windows moving around... so that's worth a try.

And I did try that myself (when I had the screen set up as two 4K screens side-by-side) but as I recall, it didn't do exactly what I wanted so I instead decided to upgrade to something which could natively support the 8K resolution.

Hi Justin.

> have tried to upvote your responses

Yeah, I tried to upvote my prior message myself so it would be easier for others to see it, but apparently the system doesn't allow that!

> Can I ask what DP2.1->USB-C cable you're using?

Yeah - I did post a link to that in a prior post, but here it is again: [now edited to show the correct link!]

https://www.amazon.com/gp/product/B0CHFKKN6F/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

I think the 3ft option is the best option.

I am still getting the odd flicker every-now-and again, although I haven't seen it all in the past few days, and I think it may be related to fluctuations on my home's 110V electrical supply (I noticed it was doing it several times one day when the drier in the laundry room next door was on), so I'm going to see if a voltage regulator on the power supply to the monitor fixes the issue completely.