Dell U4919DW / MacBook pro 5k issue

I just installed a 5K Display from another vendor (Philips 499P9) with the same issue. For me switchRes helped to solve the issue. Give it a try (10days free, then 14€). I'm using a MBP15 2018 with Mac OS 10.14.6. And ... It looks gorgeous !

I am using mine on Samsung CRG9 and Odyssey LC49G95T- both are 49" monitors. They were (individually, not separately) plugged in using a Display-Port (DP) from my Belkin dock and DP-DP cables supplied by Samsung. Immediately the M1 MBP recognised the 32:9 factor with 120 Hz & 200Hz refresh rates respectively.

When I accidentally used a HDMI port, the resolution dropped.

I use Switch Res X to confirm and set the monitor settings. It works comfortably on M1 MBP. 'Magnet' which is available from the Mac app store helps in positioning windows on the huge screen. Believe me, you will need some such or equivalent.

I don't have experience with the Dell4919DW, but I would expect the M1 MBP to handle it with ease.

Please keep in mind that the M1 MBP can handle only 1 external display. With a 49" display, only a rare user will want another external display.

Graphics for the 2016 models with 6th Generation SkyLake processors are not capable of Wider than 4096 pixels wide directly, even under Big Sur, without resorting to two interfaces and Picture-by-Picture operation.

Requires 2017 model with 7th generation Kaby Lake or later AND Big Sur to run wider on one interface.

I have the same monitor and issue. I did find a solution that lets you use it clamshell in 30Hz. What you can do is install teamviewer, remote desktop into it (e.g. from an ipad) when the lid is closed, and change the refresh rate. You only need to do it once and it will remember the setting.

Wanted to add that I got a new MBP over the weekend (non-Apple Chip - 13-inch, 2020, Four Thunderbolt 3 ports). It recognized the Dell monitor just fine and is running 60 Hertz.

No roses without thornes: When option-clicking "Scaled", I don't get the 5K2K resolution as an option. The list caps out at 4608 x 1944 although the monitor actually runs the higher resolution; which I set using Resolutionator.

This IS the solution indeed.

I am am using a 2018 MacBook Pro 15” with the Moshi usb-c to DisplayPort cable and I am able to get 5120x1440 @120hz out of it.

Mac mini 2018 + Samsung CRG90 here. I just tried Catalina Public Beta 1 and 5120x1440 does not work. 3840x1080 is still the max resolution.

Quick question, can you get the full resolution on the screen while the macbook pro's screen is active (ie not mirrored)?

Thanks!

did you use an adapter on one of the thunderbolt cables you had coming from your Mac or a usb-c to DisplayPort cable?

Need more info. What display? What is the timing info shown by SwitchResX for the resolution (pixel clock, active, scaled to, refresh)? What cable?

This work-around was described some posts above:

https://discussions.apple.com/thread/8641919?answerId=251777696022#251777696022

Please report your ig-platform-id:

ioreg -lw0 | grep "AAPL,ig-platform-id"

I’m using the CalDigit TS3, with a display port to USB-C cable to plug into the TS3. This allows you to get full 4K capability. Then USB-C from TS3 to laptop.

I'm using a MacBook Pro 15" with Mojave 10.14.6. The only cable which made me happy was the USB-C one, I tried with Display Port before, worked but not nearly as good as with USB-C.

Fixed in Big Sur!