Dell U4919DW / MacBook pro 5k issue

I am using the bundled USB-C cable and a DP to USB-C. When I enabled the PBP it automatically gave me the highest resolution. I have it set to Default for Display, the scaled is only checked to show the resolution.

I tried to speak to Apple but they gave the usual runaround of trying to reset SMC etc. When i mentioned that the display worked just fine when using Boot camp to Windows he said check with Dell that it is not a Windows compatible display only and it works with the MAC. Sometimes they can be so inflexible.

If you read the many posts here, the Trend that emerges is that Macs with a discrete graphics chip and the latest updates CAN be set up to address the full resolution of that display using one DisplayPort, and Macs that have only Integrated Graphics do not seem to be able to do that, although their specs suggest they should be able to.

Users have used the two display adapters work-around to light up the display as two halves, then combine them back into an Extended Desktop.

darenjacobs wrote:

Why does a 2018 MBP 15" drive the monitor, properly, i.e. gets 5120*1440 resolution, but the 2018 MBP 13" does not?

The 15-in is using the Discrete Graphics processor to drive the display.

The 13-in is using Integrated Intel graphics processor.

JeanLuc7 wrote:

"the Macbook Pro 2018 just can't do it."

The sad news is: it can do - but only with WIndows 10 and Bootcamp. It is just a matter of the graphics driver. With macOS, we are still stuck with the Picture-by-Picture mode and two virtual displays with 2560x1440 as a workaround.

I'm pretty sure this could be fixed if Apple wanted to. There is probably not enough demand for their Devs to take action.

Follow along:

There was a post at:

https://discussions.apple.com/thread/8641919?answerId=251185930022#251185930022

saying there was no override for the LG 49BL95.

I replied with:

https://discussions.apple.com/thread/8641919?answerId=251772844022#251772844022

saying that now there is a new override in 10.15.2 for the LG 49BL95 that might fix the problem.

The reply after that said it works for the LG 49BL95.

There was a reply to that at:

https://discussions.apple.com/thread/8641919?answerId=251773068022#251773068022

saying it didn't work with the Dell U4919DW.

I replied with:

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

saying that to make it work for the Dell, a copy of the override that was made for the LG has to be created for the Dell.

More info at:

https://gist.github.com/joevt/32e5efffe3459958759fb702579b9529

Your HDMI adapter (using a Parade Technologies ps176 I think) is only using two lanes of DisplayPort 1.2 so it can't do more than 4K@30Hz or 2560x1440@60Hz. Is it the older version of the Apple USB-C Digital AV Multiport Adapter or the newer one or a different HDMI adapter? For the Apple adapters, the model number is printed on the adapter.

https://forums.macrumors.com/threads/3rd-generation-ipad-pro-can-support-simultaneous-4k-60-hz-and-usb-3-0.2193083/

https://support.apple.com/en-us/HT207806

The EDID for your HDMI port is the same as the one from jizmodo except yours is from HDMI port #1 and his was from HDMI port #2. Interesting that they gave have different product IDs even though they don't have any other differences besides the port number.

So far we have 3 product IDs:

a107 = HDMI port #1

a109 = HDMI port #2

a10f = USB-C

I wonder if there are more for this display?

Interesting that the Intel Graphic Control panel allowed the 5120 x 1440 @ 45Hz mode.

I wonder if there's DisplayID info stored outside of the EDID? Accessible using DDC?

I believe source code for Intel graphics drivers exists in Linux. I wonder what it says about maximum width? Has the display been tested in Linux?

The work-around is to create an override that sets DisplayPixelDimensions manually or using SwitchResX, similar to the file in /System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-1e6d/DisplayProductID-9e7b for Catalina.

The following script lists all overrides that use that property:

for thefile in $(grep --include 'Display*' -l -r DisplayPixelDimensions /System/Library/Displays/Contents/Resources/Overrides/ ); do
	printf "%s  " "$thefile"
	eval $(plutil -p $thefile | grep DisplayPixelDimensions | sed -E 's/.*0x(.{8})(.{8})}/echo $((0x\1))x$((0x\2))/')
done

The work-around doesn't work for Intel graphics because macOS Intel graphics drivers do not support resolutions wider than 4096. Macs in the future that use Ice Lake (10th gen Core CPU with gen 11 graphics) will probably not have that limit.

joevt wrote:

The work-around is to create an override that sets DisplayPixelDimensions manually or using SwitchResX, similar to the file in /System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-1e6d/DisplayProductID-9e7b for Catalina.

The following script lists all overrides that use that property:

for thefile in $(grep --include 'Display*' -l -r DisplayPixelDimensions /System/Library/Displays/Contents/Resources/Overrides/ ); do

printf "%s " "$thefile"

eval $(plutil -p $thefile | grep DisplayPixelDimensions | sed -E 's/.*0x(.{8})(.{8})}/echo $((0x\1))x$((0x\2))/')

done

The work-around doesn't work for Intel graphics because macOS Intel graphics drivers do not support resolutions wider than 4096. Macs in the future that use Ice Lake (10th gen Core CPU with gen 11 graphics) will probably not have that limit.

So what you're saying is the problem is the MacOS graphics driver, because I can get the full resolution on my MBP 13", that has an Intel Graphics card, if I boot to Windows.

I spoke with Apple today, they refused to replace my Macbook Pro with the same issue! I was told that I should have checked compatibility with Dell and referenced a knowledge base article (https://www.dell.com/support/article/en-uk/sln314416/dell-u4919dw-system-requirements-and-supported-configuration?lang=en)!!

I was also told that the support mentioned on the Macbooks Pros tech spec is OK:

The Macbook Pro can support the above resolution but it can't support certain lower resolutions such as 5120-by-1440. I find that incredibly misleading!!

So all I can do is either return the monitor or purchase a new Macbook Pro with newer CPU that supports the resolution and work out what to do with the slightly older Macbook Pro.

Gutted.

Ref : Cable Matters Cable Displayport USB C (Cable USB C Displayport/Câble USB C to DP) 8K 60Hz Black 1,8m - Port Thunderbolt 3 Compatible MacBook Pro, Dell XPS 13/15

I can't find it on Amazon.com, I'm in France, so here's the .fr link :

https://www.amazon.fr/gp/product/B01LYD2Y19/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

The most important here is the 8K 60Hz, this is the 1.4 DP. I tried 3 cables, 2 hdmi (cheap and "high end") and this cable, and only this cable is able to display the right resolution

Reread the thread. We already know all this. And Apple is fixing it in Big Sur but only for Kaby Lake and Coffee Lake. They could fix it for other Intel GPUs but they won't. They could fix it for older macOS versions but they won't.

Here's a summary:

The problem for older Intel graphics (not Ice Lake) on macOS prior to BigSur with 5120x1440 displays is the width because Apple disallows width > 4096 even though width > 4096 works in Linux and Windows.

As for pixel clock, it doesn't matter because you can lower the pixel clock by using a timing with a lower refresh rate.

The chatter here is that Big Sur is a requirement to go wider than 4096 pixels wide.

(and only supported for 2017 and later MacBook Pro, which you have).

Quick update FWIW:

This morning, I tried booting into my Windows 10 side of my late 2016 MBP via Bootcamp. I was pleasantly surprised that the monitor displayed the correct resolution without any scaling! (It looked incredible!)

This leads me to believe it is a Mac OS issue and not a Mac hardware or cable-specific issue...

I just got home with a Blackmagic eGPU and plugged it into my Mini 2018, and the monitor works properly, 5120x1440, no lines, just one cable- USB3 that came with the monitor.

So if you’re using a 13” MacBook Pro this will work for you, granted you’ll be spending another $700 like I did.

For what it's worth, I have it working at 5120x1440 with a 15" MBP 2017 when using the latest CalDigit hub which has a DisplayPort (and then connects to the MacBook via USB-C.

There are periodic issues that occur when waking from sleep, including:

* Sometimes the display switches into mirroring mode when waking from sleep

* Sometimes the display does not detect a signal

* Once in a while macOS forgets that it can display the monitor at full resolution and lists 3840x1080 as the maximum

For me, all of the above issues are resolved by unplugging and replugging the USB-C cable between the hub and the MacBook.