Dell U4919DW / MacBook pro 5k issue

The preponderance of evidence suggests that only the 2020 model MacBook Pro 13-in can run such a wide display with one DisplayPort cable.

Older MacBook Pro 13-in require two DisplayPort cables and picture-beside-picture, which is why there has been so much continuing discussion on that option.

Yes ! Now, I have my brand new Displayport to USB C (1.4) cable, and it was plug and play : my monitor detect my Mac and go to 5120x1440 directly!

Now it's all good !

MacBook Pro 2018 i5 13" (Big Sur Beta 4 Dev) + Displayport 1.4 to USB C cable + Samsung 49" CRG9 = everything is compatible and look awesome

No, it's 5K wide by 1440 pixels high instead of 5K wide by 2880 pixels high. The height doesn't matter. In Catalina, the Skylake, Kabylake, Coffee Lake, and older Intel GPUs are limited to 4096 width.

The LG UltraFine 5K displays work with those GPUs because they use two 2560x2880 signals.

The 5K by 1440 displays that don't work with those GPUs in Catalina will work in Big Sur for those GPUs except for SkyLake and older GPUs.

Apple enabled single cable greater than 4096 width support in Big Sur for Intel Kabylake and Coffee Lake CPUs when the display has an EDID with a timing that has a width greater than 4096. Apple did not make the fix for Skylake CPUs so it won't work with your 2016 MacBook Pro. But it should work for the newer Macs.

https://forums.macrumors.com/threads/intel-graphics-and-5120x1440-testing-in-big-sur.2244174/

It stay at top-resolution when I turned off mirroring.

Firmware number is M2B101

Are they thunderbolt 3 cables or USB-C cables?

Connect directly to MacBook Pro Thunderbolt port (no USB-C dock) using USB-C to DisplayPort cable?

Display set to DisplayPort 1.2?

Have you tried Display Port cable? Or still with HDMI? HDMI doesn't handle high resolutions well. I have posted extensively about this. Big Sur its not a fix.

There is no requirement to turn off the internal display. The hardware for the Internal and the Hardware for the External are completely separate.

The fundamental problem is likely the adapter you are using. Most adapters will not work for this case at full resolution. This one appears to do the job, and is cheaper than most that almost work:

Moshi USB-C to DisplayPort Cable --$49.95

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I am not sure if this has been mentioned in this discussion before.

Apple takes every display's reported EDID information quite literally, and uses it to allow/disallow resolution setting from the Mac.

Dell on the other hand, has a history of using "any old EDID information that may be remotely related" and putting it into a new display's ROM, and calling it a day. Since most Dell users are using Windows, the Windows drivers simply assert the resolution in the Driver (overriding the capabilities reported by the Display) and charge ahead -- even if those settings might damage their display.

Mac Users have responded for some other Dell displays by reading out and interpreting the Dell profiles reported, then creating corrected profiles, and using the torturous Mac process of installing them manually (they are, unfortunately, inside the System Integrity Protection areas on the Mac).

Windows Build 1809. I do not believe windows version matters.

External display only.

Extended Display

I am 99.99% sure it is Mac software issue, not hardware limitation on MacBook Pro or U4919DW. If you are contacting Apple, refer to my post as a proof that every thing works properly under bootcamp Windows 10.

Your senior advisor should be demoted to junior intern. Clearly he/she just wanted to throw some terms at you and hope you would give up.

Let us look back what we have known:

1, Mac with iGPU cannot drive this monitor in macOS at 5120x1440. That is why people are discussing here.

2, Mac with iGPU can drive this monitor in Windows at 5120x1440. I tested this at page 5.

3, Macbook Pro with dedicated GPU can drive this monitor in macOS at 5120x1440. JimmyWillis at page 6.

From 1 and 2, we know it is not a Dell problem nor Apple hardware, because it works in Windows. From 3 we know it is a Mac with iGPU problem because dedicated GPU work in macOS.

@Design4Paragon

I can confirm following:

1, Mac with iGPU cannot drive this monitor in macOS at 5120x1440. That is why people are discussing here.

3, Macbook Pro with dedicated GPU can drive this monitor in macOS at 5120x1440. JimmyWillis at page 6.

We tried this out here at the office with a Macbook Pro 13" 2018 and an older Macbook Pro 15". The 15" works beautifully directly plug-and-play without any change settings. Impossible to get the 13" to get the full resolution in MacOS.

Hi Don,

What I did was set it up as 2 monitors, but then enabled extended desktop, so it actually acts as a single monitor.

And truth be told, I am actually liking it more this way. First, it works perfectly with Magnet (A kind of manager I use when I have many windows open at the same time). More importantly though, I works really well with Skype like this when I have to share my screen via skype to clients.

When sharing my ultra-wide screen to clients who are on 16:9, what they ended up seeing was a long skinny view of my monitor that was impossible to read. Now by sharing 1 of the, lets call them "virtual" monitors via Skype, they can see my screen properly. This is important for me because I depend on Skype and other screen sharing methods to demonstrate our software to potential clients.

As for color differences, I set the color profile to the same for both "screens" and it works perfectly - no color difference at all.

Anyway I agree with you that it SHOULD WORK because its what Apple and Dell promise, but even if they did release a software update now, I might just stay with my current arrangement anyway.

Regardless of this: This monitor is freakin' gorgeous, and the Mac Mini is performing really well. The combo is super elegant, runs very cool, and really cleans up my desk. I highly recommend this combo even with the glitch as the world around is convenient in my opinion.

So I had my final conversation with my Senior Advisor today. Here is what I emailed him last week, in preparation for today's conversation...

I look forward to hearing from you this coming Monday. I had one more thing to ask you during that discussion. Here are a few thoughts...

1. 1. The Dell monitor is a 5K, SST monitor.
   2. Apple Engineering says that 5K displays are only supported for MST monitors.
   3. Therefore the Dell monitor will not be supported at 5K, and the scaling that I observe is expected behavior.
   4. However, I read at this page that the 27" LG UltraFine 5K monitor is supported by the 2016 MacBook Pro and later.
   5. I emailed LG support whether that specific monitor was an SST or an MST monitor. They replied that it was an SST monitor.
   6. Which means that premise #2 above is not always true.
   7. Which leads to the next logical question: What makes the LG 27" SST monitor compatible with the 2016 MacBook Pro and the Dell U4919DW not compatible?

He responded that an exception was probably made for the LG monitor to override the SST/MST limitation and that basically I would need to go to Apple.com/feedback if I wanted Apple to apply that same exception to this monitor. In other words, he conceded the point that SST is not always a limitation. I hope one of the other 32:9 displays is compatible.