Dell U4919DW / MacBook pro 5k issue

Of course Catalina 10.15.2 doesn't work with the Dell. Instead of fixing the problem, Apple created a work around that only works with the LG display.

You need to copy the file Apple made for the LG display into the Dell folder. Rename the file using the product ID of the Dell display. Edit the DisplayVendorID and DisplayProductID instead the file with the IDs for the Dell display.

The Dell folder is DisplayVendorID-10ac. The Dell DisplayVendorID is 4268 decimal.

Use the AGDCDiagnose command and post the result so we can look at the EDID (just need the EDID part if there's no file uploads here). Don't forget to mention the display model and how it's connected. There might be different EDIDs for different connection types (different ports - HDMI, DisplayPort 1, DisplayPort 2, etc.) or different modes (DisplayPort 1.2, DisplayPort 1.4, PbP, etc.). So get the EDID of each and post the unique ones.

In Catalina, you may need to allow write capability to root to modify the overrides folder.

sudo mount -uw /

I use the script at https://gist.github.com/joevt/32e5efffe3459958759fb702579b9529

to load multiple EDIDs from different sources (for example, if you created files AGDCDiagnoseDisplayPort1.txt, AGDCDiagnoseDisplayPort2.txt, AGDCDiagnoseDisplayHDMI.txt, etc.) then you can do the following:

source EDIDUtil.sh
loadagdcfile AGDCDiagnose*.txt
listedids

It will group all the duplicate EDIDs together and list the sources of each EDID (which file(s) it was loaded from).

You guys got me again!!!! Just when I thought Apple fixed this problem, they didn't Yes, it's 5120x1440, it's scaled!!! It's not a native resolution. It looks horrible. So now I gotta put that cable back.

OK are you using a MBP 13 or 15", because if you got the 15" to work that's no big deal, that just works. It's worked since Mojave and if you couldn't get it to work w/ Catalina you should not have upgraded.

My situation is I'm using a MBP 13" and I tried all this file override nonsense and I now see 5120x1440 (low resolution) in 10.15.2, which is the same result I use to get w/ 10.14 + SwitchResX, but it's a SCALED resolution, and it looks horrible. I wish you guys would be more specific.

HAS ANYONE BEEN ABLE TO ACHIEVE NON-SCALED 5120x1440 resolution w/ a Mac Mini or MBP 13"??

Maybe you can post information to a new Mac Rumors thread, where you can attach files (AGDCDiagnose command output, screen shots from SwitchResX, a list of files in your overrides folder) that contain info that can help diagnose the problem.

Nope, still no fix for the U4919DW. My MacBook air is still announcin 3840x1080 as the highest possible resolution for the monitor. So if I understand it correctly the LG Monitor wit the resolution of 5120x1440 is working for the Dedicated graphic card models as for the onboard graphic cards too?

@joevt: Do you have a small manual how to use your script? Maybe I can try it.

Martin243

I think you are right it started as as a mbp discussion but others with other macs have joined in.

it would be helpful though if you could tell us if your mbp is a 13 ie intel graphics only or a 15 ie also has amd card

Hg

@martin243

Apologies, there is another thread like this one that is specifically for the Mac Mini. However, it does help very much if you specify the device pertaining to your findings.

There is a considerable difference with user experience b/w MBP 15" and 13". I find with some effort you most certainly can achieve native resolution 5120x1440 on a MBP 15" / 16", however, I am unaware of anyone having success getting the native resolution with MBP 13 / Mac Mini.

joevt wrote:

Maybe you can post information to a new Mac Rumors thread, where you can attach files (AGDCDiagnose command output, screen shots from SwitchResX, a list of files in your overrides folder) that contain info that can help diagnose the problem.

I'd be happy to do that, but my question is have you or anyone else been able to get native 5120x1440 (non-scaled) resolution on a MBP 13" or Mac Mini?

I doubt that the Intel HD Graphic Card is the problem or the performance limit.

If you use Bootcamp the 5120x1440 are working out of box without and problems! It is definitly a MacOS driver or better settings problem that Apple needs to fix! Every Windows laptop with USB-C and Intel Graphics Card is working flawlessly at the resolution of 5120x1440x60Hz.

It's got nothing to do with the hardware, put Windows or Linux on the same machine and it'll work straight away at the correct resolution.

MacOS does not support the extended portion of the EDID profile the defines the native resolution and thats due to the 1.3 spec stating that 4096 is the largest width expected.

I'm currently running 4096x1440@70hz on my 49" Philips on a 2015 Macbook with Intel graphics.

macOS does support the extended portion of the EDID (if you are referring to DisplayID extension blocks). That's how displays advertise resolutions greater than 4096 wide. It's where SwitchResX puts such custom resolutions in override files.

You can try the following command in Terminal.app to see if macOS at least tries to add the 5120x1440 mode. First, if you can, disconnect all displays except the one you are testing - it might make the output more readable. Run the following command:

log stream --predicate '(sender contains "Thunderbolt" or sender contains "Graphics" or sender contains "Display") and (not message contains "surface is not detached")' --style compact --debug --signpost

Press "Command-K" to clear the terminal window. Power off the display or change the input to one that is not connected, or disconnect the display. Wait a few seconds. Press "Command-K" again. Power on the display or change the input back or reconnect the display. Then copy the results to a text file after it has stopped scrolling.

In the log, you should see Hot_Plug, then EDID, then DPCD_Info, then it tries to validate and install all the timings and modes. You can grep for Active:\d{2,}x\d+ for all the modes that are attempted. Some of them should be the 5120x1440 resolution. It might say why it was declined. The errors I get with the 4104 resolution is "Mode with width 4104 and max 4096 rejected with multilink set to 0", "Source size is out of bounds", "because Driver_Validation".

Joevt,

Yes, the hardware MBP 13" w/ Intel Graphics card is capable of 5120x1440 resolution as evidenced by booting into Windows on a MBP 13". Windows can display this resolution on this laptop. This is not a hardware issue this is an OS issue, which would be nice of Apple addressed.

Did you check Intel Graphics Control Panel? Does it show the 5120x1440 mode there? Can you make a custom resolution 5120x1440 50Hz? I would like to see screen shots in Windows and AGDCDiagnose output in macOS. I wonder if Windows is using MST? macOS support MST for some 4K displays. AGDCDiagnose might give a clue. HDMI doesn't have MST. If the display has an HDMI 2.0 input, then you could try that in Windows and see if it also supports 5120x1440 that way? If it does, then we can say it's working without requiring MST. Check the log stream output I mentioned in my previous post to see if you get the same errors.

Hey community - first I just want to say thank you for collectively chasing this one as far as you have! I have actually learned a lot after 28 pages of posts :)

I also have a 2018 MBP 13" - and I just purchased the new samsung grc9 49" monitor this week and hit this same issue. And, I did not find a similar thread on the samsung site, so broadened my search and landed here.

Thank you to those who found the work-around of PBP with sep spaces turned off - it ain't ideal - but at least I can sleep at night! I also agree that for those of us who do regular skype/hangout screen sharing - this mode actually has some merit.

Any way - just wanted to say thanks for chasing this one for a year - and come-on #Apple - please figure this one out!

Great, you solved the problem with Intel graphics by not using Intel graphics...

Any eGPU with an AMD card would have worked.

The Blackmagic eGPU is kind of sad. It uses an AMD GPU that can support 6 displays but it only expose 3 of the outputs (4 on the Pro version). On both eGPUs, two displays (or one dual-link SST Thunderbolt display) can be connected via the Thunderbolt 3 port. While the Thunderbolt 3 port supports two DisplayPort 1.4 signals, both DisplayPort signals cannot use full DisplayPort 1.4 bandwidth because Thunderbolt 3 doesn't have enough bandwidth for that.

SwitchResX is just a utility for modifying the system override files and some preferences. That could be done manually. But it is much more convenient and has other features (that I don't use) and it might be necessary as a display resolution picker if the normal Display preferences doesn't show the mode you want (even after you hold Option key and click Scaled.