Dell U4919DW / MacBook pro 5k issue

Hello guys, quick update:

The full resolution works on the new MacBook Pro 13 with the 10th gen CPU. I contacted Apple support regarding this problem and managed to get a full refund for my MacBook Pro 13 2019 model and got myself the new 2020 model with the new CPU.

My MBP is also not in the refund window. Apple made it seem like I can get a refund if I had bought it directly from them. Unfortunately, I had bought it thru a reseller via the military base exchange and I can see the reseller not accepting returns due to the refund window passing. I haven't tried going in the store to try since this COVID thing. Makes me rethink on buying any apple products other than directly from Apple for proper support/returns especially in this situation. You would think the apple warranty support should cover it but I'm getting tired of spending additional hours on top of the countless hours I've already spent.

Thanks for the info!

I was having the same issue with my late 2017 12" MacBook. The max resolution I could do is 3840x1080. Downloaded

SwitchResX, I was able to achieve 5120x1440 (low resolution). Was not useable at all. I also tried a couple things, used a Dell USB-C doc, still the same result. Guess there isn't a solution to get 5120x1440. I sold this 12" MacBook last week and purchased 16" MacBook (2019). I happy to report that 5120x1440 works perfectly !

"It's not Apple! It's not us! It's Intel!"

But you are wrong, Apple. The Intel Graphics Processing Unit supports 5120x1440 - which is actually not 5k, but 2.5k. Just install Windows on Bootcamp on your Intel-GPU Notebooks, and you will see a perfectly supported DELL, Philips or whatever 49" 32x9 display with 5120x1440.

So Sajhd, you may get a refund, but they are not telling the truth - they have to upgrade their Apple Graphics Driver for Intel. And it is possible - iof you read through the thread, you will find that Apple itself launched a work-around for the LG 49" monitor, which makes this one work at its original resolution.

JeanLuc7 wrote:

So Sajhd, you may get a refund, but they are not telling the truth - they have to upgrade their Apple Graphics Driver for Intel. And it is possible - iof you read through the thread, you will find that Apple itself launched a work-around for the LG 49" monitor, which makes this one work at its original resolution.

Apple did not make a work-around for Intel graphics. The new Intel graphics with 10th gen CPU and Gen11 graphics just doesn't have the 4K width limitation but it's not the same GPU as the Macs with older Intel GPUs or the MacPro6,1 with the broken AMD GPUs. Apple's workaround was for newer AMD GPUs only.

With Linux Intel graphics drivers, it appears all the Intel GPUs use the same code and the fix for 5K was just one line of code.

Look at: https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/i915/display/intel_display.c

Compare

skl_max_plane_width (Skylake, 6th gen CPU, Gen 9 GPU)

glk_max_plane_width (Gemini Lake SoC, Gen 9.5 GPU)

icl_max_plane_width (Ice Lake, 10th gen CPU, Gen 11 GPU)

Patch:

https://patchwork.freedesktop.org/patch/329143/?series=66286&rev=2

Linux GPU Driver Developer's Guide:

https://dri.freedesktop.org/docs/drm/gpu/index.html

Intel graphics documentation:

https://01.org/linuxgraphics/documentation

Ice Lake supports 5120 for all tile types (Linux doesn't support 6K?) while Skylake has 5120 only for I915_FORMAT_MOD_X_TILED type with 4 bytes per pixel. Actually, if 8 bytes per pixel allows 4096 then 4 bytes per pixel should allow 8192?

Perhaps Apple's graphics drivers have other limits that don't allow this fix (uses other tile types?)?

Mister_Highping wrote:

The System Information.app shows the following information:

Intel UHD Graphics 617:

And the AGDCDiagnose is attached to this post.

<AGDCDiagnose_Big_Sur.txt.log>

It looks like System Information.app in Big Sur has not improved on the set of info it reports. It's still basically useless because it does not show output resolution or output pixel format or output color space.

Your AGDCDiagnose output from Big Sur is very similar to the last version you sent from the previous macOS version. I forgot that AGDCDiagnose does not include output resolution size for Intel graphics (unlike AMD graphics) so there's nothing there we can use as sufficient evidence. We need a screenshot of the timing info from SwitchResX in the Current Resolutions tab (double click the resolution to see the timing info), or output from the command

log stream --style compact --debug --predicate 'message contains "5120x1440"'

showing 5120x1440 timing (not scaled) succeeded.

SwitchResX works in Big Sur but there are some minor issues:

• the menu icon sometimes gets drawn in the middle of the screen - click it to restore its position to the menu bar
• the radio button in the Current Resolutions list does not always point at the current resolution - use the menubar instead
• the Custom Resolutions status is not always updated after an Activate - turn off or disconnect display, then turn on or reconnect

I did try adding a 5120x1440 60Hz CVT-RB timing on my Mac mini 2018 (Intel UHD Graphics 630). It works for my DisplayPort display when connected to AMD RX 580 but not Intel.

I tried looking at CoreDisplay.framework for strings that might be new preferences but the code for frameworks is not in the usual place. https://lapcatsoftware.com/articles/bigsur.html

Grant Bennet-Alder wrote:

When you use Picture BY Picture in conjunction with Arrangement on the Mac, the two screens are connected at the virtual "seam" between them and work completely as one. The mouse moves freely across the "seam" and you can park a window half on each display -- filling as much or as little of each display as you like. when you scroll that window, it will scroll "the right way".

Oh so I could also "split" the screen in 3 windows - left, middle, right? If so, what's the difference between this workaround and the "real deal" using it as one screen with the full resolution?

But yes on older MacBook Pro this requires two cables. At this writing, it continues to be thought of as a deficit in the graphics chips used -- the 2020 models [four ThunderBolt ports] with more advanced graphics chips have no problems. No one knows whether Apple will release software that can work around the issue. It may not be possible.

Huh, I thought Mister_Highping got it working with his MacBook 2018 on Big Sur (see screenshot he posted on june 26th)? Plus I thought I read that on a Windows installed on an older MacBook it's working too. That's why I was sure it was a software issue. Is that wrong?

There is no way to know for certain whether Big Sur will make anything "better" in this regard. My advice: "Don't bank on it, until Big Sur is released."

****. I really like the Dell and the 49" curved screens in general. Do you know if it's the same issue with all of them? e.g. the Samsung C49RG94SSU or the LG 49WL95C-W?

Hi,

if you are speaking of macOS, with PbP you must always disable the „Desktops use different spaces“ option. Otherwise windows will be cut, when they cross the middle of the screen. With Windows 10, this is not necessary.

Awesome, thank you guys! That was it. The displays were not aligned properly.

Now I have only one issue left: The color or brightness on the "left screen" is slightly different than on the "right screen":

I can't find a setting for each individual virtual screen. Do you know what to do?

If the MacBook Pro (13-inch, 2018, Four Thunderbolt 3 Ports) is just a slower CPU than MacBook Pro (13-inch, 2019, Four Thunderbolt 3 Ports), then the Big Sur beta might fix your problem. If it does, post your setup info and screenshot at

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

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!

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.

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).

I can confirm that updating to Big Sir fixes this frustrating issue. Man this is such a relief.

My current setup:

Monitor Samsung CRG9 49"

MacBook Pro 13-inch 2017

Processor 3.5 GHz Dual-Core Intel Core i7

Memory 16GB

Graphics Intel Iris Plus Graphics 650 1536 MB

I just got an adapter for the CRG9 and it works great (just a standard USB-C to DisplayPort 1.4). However, I went to connect my 2560x1440 monitor to the other thunderbolt port on my MacBook using a dongle and it works! For about 10 seconds, it then puts the MacBook to sleep making my displays go to sleep too. Any suggestions?