Dell U4919DW / MacBook pro 5k issue

According to this website, every connection type should produce full resolution with the exception of HDMI 1.4...

Odd that nothing is working. Someone marked this thread as "Resolved." Since it hasn't been resolved, we might benefit from "Unresolving" it. Might generate more discussion from the community.

Also curious to know whether it is an Apple problem or a Dell problem. I talked to both and they said that it "should" work. Has anyone called Apple or Dell support and had them walk through step-by-step?

But shouldn't the USB-C cable that comes with the monitor, or the USB-C cable that came with the MacBook Pro be sufficient? Seems odd that you would need an adapter when you can plug right into the monitor directly with their own supplied cable.

So I've just purchased the Moshi USB-C to DisplayPort on the advice of this thread .... only to find it's EXACTLY the same with no difference. Still only getting 3840 x 1080.

I'm now waiting on an Apple Chat Support to see if they can help!

Spoke to the advisor on the chat and after asking me to try all the troubleshooting procedures that I've already been through ... I've now had to schedule a call for tomorrow so a senior advisor can remote in and take a look.

I'll update again at that point as this is getting silly now.

So I've also contacted Dell support and after going backwards and forwards with the usual troubleshooting procedures, this was their response :

I totally understand your concern, however, please be advised that the resolution will still depend on the system where your monitor is connected to. The monitor is still working as designed as it shows that the Mac mini's maximum resolution is 4096x2160 at 60Hz. In addition to that the monitor has its own resolution, your Mac mini and the monitor will meet half way for the screen resolution output.

If you have the most recent Mac mini, it should have a maximum resolution of 5120x2880...

I found that right on Apple's website https://www.apple.com/mac-mini/specs/.

So he was wrong in stating that the maximum resolution is 4096x2160 (unless you have a different model). I also am unsure what he means by stating that the resolution will "meet halfway."

jkastan's experiment above would seem to indicate that it's a software issue rather than a hardware issue. And my suspicion is that it's a Dell issue instead of an Apple issue. I'd be interested to see if the issue could be moved higher up to a "Senior Technician" at Dell.

But then again, at least for my late 2016 MBP 13", this seems to suggest that it should be able to do it with just one cable: https://9to5mac.com/2016/11/17/macbook-pro-external-display-requirements-4k-5k-a dapters/

Interesting — any idea on how to go about correcting the EDID information specific for this monitor? I have tried playing around with the EDID information settings after disabling SIP, but unfortunately I did not have any luck.

Apple rang me yesterday as promised, but only to say they are still looking into it.

Dell have apparently escalated my issue to senior team .... but I'm yet to hear anything.

I'm still working on the @jkastan solution so far to at least save my sanity.

Thank you for testing this, it's great to see that we are narrowing down the fault to a point where it is, as you say almost certain a Mac OS software issue.

I'll point your last post to the senior tech engineer looking into my case and see what they say.

mackie_the_knife--

Can you tell us a little more about that?

What software is used to read that data?

What is the difference between the blocks Macs CAN read and this block, which appears to be the one users bought this display to perform?

I was able to get a dump using SwitchResX. Mine looks the same as what mackie posted. Here is my full dump file. I have had no luck specifying custom resolution values with SIP disabled using SwitchResX.

Feeling lost and disappointed. Glad to know it's not just me, but anxious for a fix nonetheless.

Dump:

http://cloud.clever.ly/4e2704336172

I had a good conversation with Apple support today. I spoke with a Senior Advisor and he took a bunch of logs and forwarded the info along to Engineering. He will call be back January 3 with an update. In the meantime, if anyone else hears of anything, keep us in the loop!

I don't want to distract from this thread, so I've created another thread to address another issue I'm having with the monitor. I'm having difficulty connecting USB-A devices to the monitor and having a consistent connection with the MacBook. If you're having this same problem with the Dell U4919DW, please contribute to that discussion...

https://discussions.apple.com/thread/250047336?page=1

if you work with photos/videos or doing something professional you will notice at bit difference which looks like not a big deal for office/surfing applications.

BTW: I use the screen at comfort view mode.