Dell U4919DW / MacBook pro 5k issue

There is no "Intel graphics Driver", at least none provided by Intel. It's all about macOS. You may have read that Apple provided a work-around for an LG 49" monitor - but only for this manufacturer. Instead of providing singular solutions, they should solve this issue for good.

I fully understand your complaints. But we also know that it works fine with AMD graphics chipsets. 15" and 16" MBP owners don't have this issue. eGPS owners don't have it. It is only a flaw with the Intel graphics driver provided by Apple. And we also know that the Intel graphics driver for Windows works fine. So we are at the same question since 2006 with the first aupported Intel chipset with GMA950: why does Apple develop their own graphics drivers? Why don't they ask professionals at Intel to perform this task successfully (and with the same speed as with Windows)?

DisplayPort 1.4 cables are not extremely rare (club3d sells many that are also VESA certified).

DisplayPort 1.4 cable is not required for 5120 x 1440 (5120 x1440 requires less bandwidth than 3840 x 2160 Hz!)

A DisplayPort 1.4 cable is not going to make a DisplayPort 1.2 GPU work as DisplayPort 1.4.

A GPU cannot tell the difference between a DisplayPort 1.2 cable and a DisplayPort 1.4 cable. A bad cable may cause static to appear.

The latest MacBook Air 2020 does not have a problem with single cable 5K wide displays (it supports DisplayPort 1.4 and DSC).

Macs that have the problem in macOS with wider than 4K timings might not have the problem in Windows. If Windows can do it, then Apple could make macOS do it (but maybe some features that made them not allow greater than 4K might not work anymore? - anyway, you are right, we should not expect Apple to fix this - get a refund, get a new GPU, or get a new display).

USB-C cables that support 10 Gbps also support DisplayPort 1.4 (which is only 8.1 Gbps per lane).

Yes - DELL has adjusted their specs page lately. When I bought my DELL, there was nothing special about this - and that is exactly what is going on here: Nothing special. Intel's graphics drivers for Windows do not even know about special resolutions. They know about a maximum frequency for data, that can be calculated by frame rate x resolutionX x resolutionY x colorDepth. And the DELL is way below this maximum - that is why Bootcamp Windows on a Mac with Intel GPU works like a charme with the DELL.

It's the Apple Driver, but Apple tells us they will not even try to fix the issue. It's that easy.

Update: don't want to risk updating to Big Sur, so for now I'm comfortable with running PBP 2-1 mode, the resolution is the same at the end of the day, just not as convenient as having a single ultra wide screen.

Yup! This worked!

Unearthed a DP-DP cable. Connected through the Belkin adapter to the TV. Lo behold! About 30 odd choices of resolution of 32:9 aspect ratio showed up on SwitchRes X icon on the Mac's menubar, including 5120 x 1440 @60Hz. Apart from this, there are even higher resolutions showing up including 6720 x 1890 @60Hz. Totally different!

OS X Big Sur's Display Preferences show 5120 x 1440 as a native resolution for this monitor.

I am using a Belkin hub (about 3-4 years old, that has a DP out. Using Samsung's supplied DP-DP cable, it worked like a charm. Please see my post of 05Jan21. It is reproduced below:

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.

Hope this works for you.

https://www.displayport.org/faq/#tab-displayport-over-usb-c

What is the best way to connect a DisplayPort over USB-C video Source device to a display that uses a standard DisplayPort receptacle?

It is preferable to use a USB-C to DisplayPort adapter cable, and it is best to use a DP certified adapter cable. This cable has a USB-C plug on one end, and a DisplayPort plug on the other end (either a mini-DP or standard DP plug). The DisplayPort over USB-C Standard was designed to accommodate such adapter cable. While there are USB-C to DisplayPort receptacle adapters on the market which enable the use of a standard DisplayPort cable (one with a DisplayPort plug on both ends), use of such adapter is not recommended because it may result in poor picture quality, intermittent operation, or no video display.

I am not technical so I cannot answer detailed questions - this is my experience...

I have a MacBook Pro (13-inch, 2018, Four Thunderbolt 3 Ports), connected directly to the Dell U4919DW with the stock USB-C cable [I think - what came in the box] running at 5120x2160 60 hertz with no modifications or extra gear.

Prior to Big Sur, the resolution was not pleasant but after the OS upgrade, I get the above resolution without effort or adjusting settings. I doubt this is helpful but perhaps something in the above is useful.

The previous 2 years were very disappointing and I pretty much have up hope...now, it is SO MUCH BETTER.

Hallo

I had the same. With SwitchReX (or similar) i selected 2560 x 1440 native and it worked. Not sure why it does not show that. It seems for me the MacBook just has an issue with the vertical resolution of 1440.

I've been having a similar issue with my 2019 MBP scaling correctly to a 34 inch widescreen monitor. I've read through this thread and it seems to be an issue with the Intel Iris graphics card BUT I did stumble upon this:

https://www.youtube.com/watch?v=**2hXa_iy9k&t=49s

He recommends an 8k bidirectional USBC to DP wire for full resolution. I ordered and will try.

So I recently got a 2020 13" MacBook Pro (i7; 32GB; 1TB; Intel Iris Plus). I am running the following:

ProductName: Mac OS X

ProductVersion: 10.15.7

BuildVersion: 19H1217

Using a Cable Matters USB-C to DisplayPort cable combined with Resolutionator, I have found success in achieving the elusive 5120x1440p@120hz resolution!! It's quite amazing and buttery smooth!

It‘s Not related to mac Hardware. My MBP is with bottcamp and Windows is Working with this Dell Screen

Actually, my typo "of" means "off", sorry for the misunderstanding. Uncheck the checkbox "Displays have separate Spaces" in Mission Control, and you are done.

10.15.4 just came out. Any change with that? I expect not but I wonder if some Intel graphics changes for MacBook Air 2020 affects older Intel graphics?