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Dell U4919DW / MacBook pro 5k issue

Hi,


I have just purchased the Dell U4919DW monitor to use with my early 2018 MacBook Pro 13", but unfortunately I cannot choose full resolution 5120x1440 in the settings, max is 3840x1080. I have tried the app SwitchResX to manually set the 5k resolution without luck, only scaled.


From this link I read about my MacBook before purchasing the screen that:

"this model supports a maximum resolution up to 4096x2304 at 60 Hz at millions of colors on two external displays or a single external display at a maximum resolution up to 5120x2880 at 60 Hz at over a billion colors via Thunderbolt 3 (USB-C)."

MacBook Pro "Core i5" 3.1 13" Touch/Mid-2017 Specs (Mid-2017 13" (Touch Bar), MPXV2LL/A*, MacBookPro14,2, A1706, 3163): …


My MacBook Pro has 4 USB-C ports, I'm using the left ones which operate at full speed (right ones are reduced).


Why can't I get full 5k resolution? Is it an issue with the MacBook, the connection, the screen or perhaps an iOS issue?


Additional links with information on the screen:

https://www.dell.com/support/article/dk/da/dkdhs1/sln314416/dell-u4919dw-system- requirements-and-supported-configuration…

https://www.dell.com/support/article/us/en/19/sln314339/dell-u4919dw-monitor-usa ge-and-troubleshooting-guide?lang=en#Usi…

https://www.dell.com/en-us/shop/dell-ultrasharp-49-curved-monitor-u4919dw/apd/21 0-arnw/monitors-monitor-accessories

MacBook Pro TouchBar and Touch ID, iOS 12.1

Posted on Nov 21, 2018 11:09 PM

Reply
682 replies

Jul 26, 2020 2:43 PM in response to jeremy.george

Which MacBook Pro 2017 do you have? Only the two 13 inch models will have the problem. The 15 inch has AMD graphics so it will not have the problem. Since you have left and right ports, you probably have the model "MacBook Pro (13-inch, 2017, Four Thunderbolt 3 ports)".


EDID modification for RGB fix is only needed for HDMI. Are you not using USB-C/DisplayPort?


The Dell display is not a Thunderbolt display, so of course it does not appear in the Thunderbolt section of System Report.../System Information.app. The USB hub of the display and the USB devices connected to the USB hub should appear in the USB section of System Information.app. The ports on the MacBook Pro are Thunderbolt, but the Dell has a USB-C port, not a Thunderbolt port. The cable is USB-C, not Thunderbolt (but it might work with Thunderbolt devices at 20 Gbps?)


The native resolution works because you were running Big Sur. Not because you changed the port. If there is really a difference in the MacBook Pro Thunderbolt ports, then maybe the AGDCDiagnose command can tell you the difference (except it doesn't provide as much info for Intel as it does for AMD). Are you using the same port on the display for each test? The USB-C port of the display, correct? You should test all four Thunderbolt 3 ports.


Consider posting your Big Sur findings/info/tests at

https://forums.macrumors.com/threads/intel-graphics-and-5120x1440-testing-in-big-sur.2244174/

Aug 7, 2020 1:02 AM in response to kanonendk

Hi


I have a MacBook Pro 2018 13" 4-port Thunderbolt 3 and a Samsung C49RG9 display, with a native resolution of 5120x1440.


I read everything I could on google but I don't have a solution. I'm on the Beta 4 from Big Sur, and I tried an HDMI to USB C and single HDMI cable with an adapter. I got a completely overwritten image with the HDMI to USB C cable and a 3840x1080 image with the adapter. But no 5120x1440.


I ordered a Displayport 1.4 (8k at 60Hz) to USB C cable, I haven't tried it yet, hopefully I'll get a miracle.


Have you had feedback from people who got the native resolution with only one cable?


Thank you!

Aug 8, 2020 4:29 AM in response to OiseauPy

There is a report that single cable 5120x1440 works with the MacBook Pro (13-inch, 2019, Four Thunderbolt 3 ports). If the 2019 is just a minor upgrade of your 2018, then your 2018 might work in Big Sur. If you try it, report your system info and results to https://forums.macrumors.com/threads/intel-graphics-and-5120x1440-testing-in-big-sur.2244174/

I haven't tried the public beta yet. Big Sur is only in beta so things could change for release.

Aug 10, 2020 12:36 AM in response to yves184

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

Aug 10, 2020 1:13 PM in response to OiseauPy

The cables you want for HDMI-only Monitors (higher resolutions than HD TV sets) are marked as Certified with an anti-counterfeiting tag and are labeled:


"Premium High Speed HDMI cable" or that + "with Ethernet" --OR--

"Ultra High Speed HDMI cable" or that + "48G"


Cables with No Certification tags are good for your standard TV set, and not much more.


Sep 3, 2020 8:48 PM in response to Valuable Logic

2016 is Skylake. Apple only added SST 5K timing capability in Big Sur for Kaby Lake and Coffee Lake.


Ice Lake is new and gets 5K from the beginning because it supports DisplayPort 1.4 and DSC which allows for 6K or more.


Go to https://forums.macrumors.com/threads/intel-graphics-and-5120x1440-testing-in-big-sur.2244174/ and post the results of the information collection commands in Big Sur


kextstat | grep Intel | egrep "Graphics|Framebuffer"
ioreg -lw0 | grep "AAPL,ig-platform-id"
ioreg -lw0 | grep '<"Mac'
system_profiler SPHardwareDataType SPDisplaysDataType | sed '/.*Serial.*/d;/.*UUID.*/d'
system_profiler SPSoftwareDataType | grep System


I wonder how difficult it would be to try to get the Kaby Lake graphics drivers to work with the Sky Lake CPU... I don't know what all the differences are. I suppose one could look at Linux graphics drivers... Or maybe the changes to the Kaby Lake driver between Catalina and Big Sur could be applied to the Skylake driver (or the differences between Skylake and Kaby Lake in Big Sur).

Sep 4, 2020 12:19 AM in response to JeanLuc7

No, it's 5K wide by 1440 pixels high instead of 5K wide by 2880 pixels high. The height doesn't matter. In Catalina, the Skylake, Kabylake, Coffee Lake, and older Intel GPUs are limited to 4096 width.


The LG UltraFine 5K displays work with those GPUs because they use two 2560x2880 signals.


The 5K by 1440 displays that don't work with those GPUs in Catalina will work in Big Sur for those GPUs except for SkyLake and older GPUs.


Dell U4919DW / MacBook pro 5k issue

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