Why 5120x1440 Doesn't Work with Apple M1

I got it working. Macbook M1 pro with Samsung CR49 monitor, 120hz, DisplayPort 1.4 and Freesync to Ultimate Engine. I got a CallDigital TS3 Plus.

Someone on Reddit with an M1 MacBook Air confirmed that they got it working with the CalDigit dock.

https://www.reddit.com/r/mac/comments/jvwju9/new_macbook_pro_m1_not_working_with_ultra_wide/gd1557a/

Pagemakers, I too can get it to work (for a while); as long as the system doesn't go to sleep then everything is good (beautiful in fact); coming out of sleep then I have to pull and replace cord and often go into display settings and reset resolution.

I still haven't bought switchresx, and my last step before that is to change the DisplayPort setting on the monitor from 1.4 to 1.1 (1.2 wasn't available; its there but greyed out).

It just seems that the stated 6K TB-DP is not factual. Again I hope this is software update fixable otherwise will be returning new 49" ultra wide/MM M1 and several other accessories.

I am open to any suggestions; also am interested in whether anyone knows if this is hardware limitation or update fixable.

thanks in advance!

So Apple completed a variety of diagnostics. They want me to bring in my monitor and leave it so they can run a few tests. I was told that this was normally not allowed (leaving non-apple devices behind, so hopefully it helps the diagnosis of the issue. I can see from posts that this is happening on various monitors but Apple does not see it as an emerging issue (such as the pink squares) since not enough folks are raising formal support requests. I urge you all to do so while I sacrifice my monitor 7-10 to help the greater cause. Put in your tickets. Get it on their radar.

Alupek23 wrote:

Hi guys,

This problem still exists, but the solution is quite simple.

1- Go to SystemPreferences - Displays.

2- For the Resolution options let it be on Default for display.

3- Hold the option key while selecting Scaled.

Done. You should be able to see all supported resolutions.

Merry Christmas!

That's not a solution for most of us. I don't see 5120x1440 as an option in that menu, and even with SwitchResX there's tons of wake up issues from sleep and random disconnects even with actively using the monitor. Mac mini 16gb + Samsung g9

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 ended up having to use that screenres app to even get all of the HiDPI options to show up.

I had two choices that were in the range of what I needed to be able to see, the first one where you can see and read the fonts, but they looked like windows 95 fonts from the pre-true type era, and the very next step in magnification made the text look smooth, but it was so blown up that literally every panel in Lightroom had a scroll bar, and desktop icons were fist sized.

I don't remember what the "pretend" resolutions were since I sent the machine back, and it really doesn't matter who has managed to get something usable for themselves. I could not, any many others can't either, and it makes even less sense when these products are marketed as a "luxury" product that "just works" when something as simple as display compatibility is an issue like this at a fundamental level.

Windows reports this monitor correctly at 5120x1440, display scaling at 100%, and all the fonts are clean and easy to read.

Set your display on the mac to 5120x1440 1:1 and see if you can spot the difference. If your fonts and scaling look better, that's awesome, yours works properly.

Mine did not.

Did you try both with HDMI and Usbc-to-DisplayPort ?

Did changing cables help? Thanks

Could only make this work with switchresX

For M1 Macs, people have reported that the macOS Big Sur beta has fixed some display issues.

Caldigit TS3+

Latest Big Sur update gives me 5120x1440 120hz and freesync but only with Display Port 1.2. If I change to Display Port 1.4 I any get a blank screen. Any idea why? Samsung CR49