Why 5120x1440 Doesn't Work with Apple M1

hey I'm using the same set up - Samsung 49 inch + M1 Mac mini + Switchres X

when I add a custom scaled resolution and after rebooting, it shows "not active - invalid"?

how did you make it work?

thank you a lot

I had similar issue. One part is getting it working, the second is keeping it stable.

my primary use is through hdmi cable - this gets 4K working fine and every time (through a small USB-C hub). I have got used to this and the resolution is fine (I am mostly working on it and the 5k seems to be not much better)

my previous intel based Mac only seemed to for 4K and one of the reasons to get the M1 Mac was to use the full 5k but ironically the old Mac now works fine but the new one doesn’t (it works every time I plug it into that one but this one takes some playing around)

i haven’t found a consistent method yet but it’s a matter of cable swapping between old Mac and new Mac, having the display working on one and then switch it over to the other and/or switching between the hub (with hdmi attached) and/or rebooting etc... it’s a mess.

so far, as above, I have got it working by switching to display port version 1.2 but if I power down and on again, often it stops working... I think it’s to do with how the usbc’s 2 way interaction is not being recognised... I think that the latest/next macOS patch is the key. You can have a second device, plug it into that and switch over, option click in the display settings to detect external monitor, boot with it plugged in or not, turn it on and off and other combinations and it works after an indeterminate sequence but I am now just going to wait a few weeks hoping that the next macOS patch will have the fix

I use the M1 MacMini with a Dell U4919DW curved monitor with native 5120x1440 resolution with a direct connection via the original USB-C cable from the monitor supplied accessories. The M1 MacMini I received today is running BigSur 11.0.1 and worked at once with the right setting and auto negotiation. So the resolution seems not the issue.

Maybe the resolution Frequency combination is a hurdle for the Samsung on the HDMI since the Monitor offers 120Hz as far as I know.

I also have a Samsung Odyssey CRG9 49 curved Monitor and can confirm, that this monitor refuses to offer the full resolution over HDMI and falls back to 3840x1080. I did not test any Display-Port cables. It is either a limitation of the HDMI/Cable combination or the EIDE Firmware in the Samsung that offers the wrong data or the M1 is not able to negotiate well.

The Samsung offers by default only 3840x1080 60hz on a Gigabyte BRIX Windows 8.1 machine with a dedicated Geforce GTX760 . It can then be forced without special tools to use the full 5120x1440 with 30Hz in the System Configuration (marked as not recommended).

I did not try the "Alt-Click" on "Scaled" method in the M1 MacMini "Resolution Settings" for the Samsung yet.

I found this on another forum and this worked for me:

holding down the options key when you are in Display settings on the Mac to see extra available resolutions. Some say they can do it with SwitchResX installed (or similar software).

I do not have SwitchResX or anything installed and this worked on my LG 49WL95C-W 49" monitor. I hope this helps.

So I got a Samsung CR49 and I only can choose maximum 3840x1080 on my new Macbook Pro M1 and no 5120x1440! I'm using a new out of the box ts3 docking station. I also changed displayport to 1.2 on my samsung but still the same problem. Is this fixable or do I need tor return my macbook and stick to windows (where it works).

It’s is possible. That’s my setup.

Read through this forum and ones like it and you’ll get the info you need.

According to a recent press article Apple are aware of the problems and a fix is on the way.

Try ScreenResX... it costs about $Aus23, it helped with recognising 120hz and is more reliable (if I unplug and plug back in, previously it would rarely detect it).

The options / fixes are (maybes), helped

1.2 instead of 1.4 Ver

60hz instead of 120hz

4k instead of 5k

Next Big Sur OS version

Connect to non M1 first and switch

Try ScreenRexX (10 day free trial)

Turn on and off with connected Cable

Option Click in display to force device detection

Premium 5k usbc to display port cable

I’ve stuffed around with it for ages, inconsistent but these all improve chances or I just give up and the hdmi @ 4K works every time. Most of my work is text based so 5k doesn’t look much better anyway ironically my old intel Mac also didn’t recognise 5k but it now works instantly every time

Yes, I posted a message a few days ago saying the beta fixes the problem but the admins here removed my message warning me that I can't talk about beta versions of Big Sur here.

I am glad your post stayed at least so people know.

I did 3 months of research on what system to buy (build) that can support stacking 2x49" C49RG at 5120x1440 and had my finger on the trigger to purchase a windows PC AND the M1 mini just hit the market. I was impressed with the power consumption and looked at the spec. I couldn't believe it said 2 x 5120 support. I open a chat to confirm and I asked the rep at least 3 times and said I don't believe it and s/he himself was amused that I couldn't believe it. I was assured it supports it and we are talking APPLE company. Their products go through extensive quality assurance and I was sold with the marketing. 

I ordered the 16gig 8gpu. I can't even get 1 C49RG to work. It took me 3 days just to research, buy a new cable and hold the option button down and do this and that and finally got it to come up, BUT now I have to disconnect the cable and re-connect it 2 times for the screen to wake up. 

The mini has crashed on me 2ice. *CRASH*. when did you ever hear a mac “blue screen”!? System preferences unexpectedly crashed on me. (I have screen shots) I use Visual Code for work. It crashes on me. This morning it had rebooted on me and all my apps were moved around. I don't have auto-update enabled. I tested Java on my wife's M1 laptop and it worked. But now that I use it more the memory usage all of a sudden jumps 1gig every 3 seconds and I have to kill the process with mem usage 25+ gig. 

I am disappointed. if you want a mini (M1) to just browse the web and iMessages, then go for it. M1 release is premature. not happy!  Oh not to mention my bluetooth devices connect and disconnect. My headphone & Logitech Craft keyboard doesn’t even connect. I am calling BS on Mr Cook!

On the Samsung 49 inch monitors it seems if you turn on the monitor first and then the Mac mini it picks it up right away.... if the Mac mini is fired up first it’s a disaster.... and waking from sleep is a crap shoot.... sometimes it fires right up other times it’s a cord plug and unplug fiasco; definitely some issues with the Mac mini m1 variation and these big monitors.....

I would really help others if you exactly specify which one (really a mini M1) and OS version/revision you are already on or you upgraded on, and what Samsung 49 model/revision (regional?) exactly you are using. And to continue what port on each side and the type and quality of the cable you are using, because there are a few out in the wild and then finally what version of firmware you have on your Samsung Monitor exactly.

It is a non working non symmetric turn of the direction of causality (aka logic) to think if that if your setup is working -> all other similar but not equal setups are now working.

Helping others (and yourself) in IT challenges (hard- and software) without detailed setup information is a PITA.

Exactly describing your working septup instead of pointin to a long thread would help a lot! So give you some nudging and complete this if affordable. Thanks in advance.

"Everything (found) on the internet has to be created or written first and needs to be published at the end. If you make it impossible to find for others, you are just talking to yourself." - acsr

Use a display link. It works. They said clamshell wouldn’t work either and I’m doing it with my MacBook Air with the M1 and targus 180usz no issues with 2 1440p Samsung sh850’s

if you’re trying to do things nativity just stop you’ll **** your self off just buy a display link and you can do anything you want.

Just wanted to pop in here and give some good news...

Just bought my first Mac Mini. Of course, it's an M1.

My biggest fear was that it would not drive my 46" Samsung CRG9 (I think that's the model).

Taking the advice of a YouTube video, I installed the next version of Big Sur. I'll let you figure that out. My post was removed by the agressive moderation here in trying to help people get their display problems fixed because I mentioned the "B" word.

In any case, I was immediately able to get 5120x1440 resolution in my choices of 60Hz, 100Hz and up.

My display is performing wonderfully. No issues whatsoever.

I am using a 40GB/60HZ TB3 cable from the Mini to a Caldigit dock. Then from the Caldigit dock I use an ordinary display port cable.

MSAGA146,

I have the same exact monitor and it's working beautifully with the M1 Mini.

You need to be on Big Sur 11.2. Not sure if it is out of public beta or not. I think it was just released.

THEN you can get the resolution you are looking for. If not, you can do so with the help of SwitchResX software.

I have no issues with waking up the monitor. There was a one-time issue where I woke up the monitor and there were all these color distortions. I just rebooted the M1 Mini and it was fine. Only happened once. Otherwise, having much success here.

So I’ve finally fixed it.

Big Sur 1.2

Samsung CR49 Ultrawide monitor

5120x1440 120hz

Freesync Ultimate Engine

Display Port 1.4

No additional software or boxes. System happily sleeps, wakes and reboots.

Cable £22 from Amazon

https://www.amazon.co.uk/dp/B08B3SB5VC?ref=ppx_pop_mob_ap_share