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UP3218K only runs at 4k

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Here is the output.

With the mtdd file for the UP2715K the display shows up as a single display (instead of two) but the 5120 x 2880 resolution is stretched over the two DP inputs (so you have to switch input to see the other half).
Thanks for this. You are saying the that the Dell UP3218K shows a 2560x2880 image stretched to the entire screen? This might suggest it can't support a 5K dual cable timing like the Apple 6K display.

Are you running Catalina?

Did you remove Apple's override file at /System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac/DisplayProductID-4147? It contains edid-patches that remove the following timings:
Code:
[email protected] 130.742kHz 1030.25MHz  h(30 10 160 +)  v(3 5 40 -) 16:9 preferred
[email protected] 104.855kHz 826.26MHz  h(48 32 120 +)  v(3 5 41 -) 16:9 preferred
[email protected] 212.062kHz 856.73MHz  h(48 32 120 +)  v(3 10 85 -) 16:9
[email protected] 262.079kHz 1058.80MHz  h(48 32 120 +)  v(3 10 35 -) 16:9
and it removes the Tile display info:
Code:
Tiled display block (12h):
  Capabilities: 0x82
  Number of tiles: (2 x 1)
  Tile location: (0, 0)
  Tile dimensions: (3840 x 4320)
 
Thanks for this. You are saying the that the Dell UP3218K shows a 2560x2880 image stretched to the entire screen? This might suggest it can't support a 5K dual cable timing like the Apple 6K display.

Are you running Catalina?

Did you remove Apple's override file at /System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-10ac/DisplayProductID-4147? It contains edid-patches that remove the following timings:
Code:
[email protected] 130.742kHz 1030.25MHz  h(30 10 160 +)  v(3 5 40 -) 16:9 preferred
[email protected] 104.855kHz 826.26MHz  h(48 32 120 +)  v(3 5 41 -) 16:9 preferred
[email protected] 212.062kHz 856.73MHz  h(48 32 120 +)  v(3 10 85 -) 16:9
[email protected] 262.079kHz 1058.80MHz  h(48 32 120 +)  v(3 10 35 -) 16:9
and it removes the Tile display info:
Code:
Tiled display block (12h):
  Capabilities: 0x82
  Number of tiles: (2 x 1)
  Tile location: (0, 0)
  Tile dimensions: (3840 x 4320)

I'll grab pictures of it later tonight or tomorrow.

I'm running Mojave right now but plan on putting another SSD in the system to boot Catalina. This is on a Mac Pro (5,1) though.

Also I didn't remove the override file. I'll try that too.

UPDATE:
Removed the override file and now it runs at 7680x4320@30Hz (10-bit) and rendering the output at 3840x2160. It is seen as a single display with no output from DP2.
 

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So would the next logical step be to install Catalina and see if it acts any different?
 
So would the next logical step be to install Catalina and see if it acts any different?
No. I don't think Catalina would act differently, but it might be interesting to try - just to get a baseline.
The next step is to create a mtdd file like the UP2715K except make it for 8K. I'll make one later. I am currently testing a dual cable DisplayPort 1.4 4K 144Hz display (Acer XV273K).
 
Yeah, I opened the UP2715K mtdd but I couldn't really get anything out of the data blob it provided. How would I go about making a 8K mtdd file?
 
Yeah, I opened the UP2715K mtdd but I couldn't really get anything out of the data blob it provided. How would I go about making a 8K mtdd file?
The overlay is a modified EDID. I made an EDID editor script to make the changes. I've been trying with the Acer XV273K but have had no luck. The presence of the mtdd file and two DisplayPort 1.4 connections just causes the screens to go black and reset repeatedly. I guess I'll switch to creating an mtdd for the UP3218K. I'll post my EDID editor script too - later today.
 
I've attached my work.

- EDID from UniqueNameIdentifier contains the Dell UP3218K info. There is a mtdd file in there to try.

- EDID from JoesMacMini contains my failed attempts for the Acer XV273K. I am able to create patches to add single cable resolutions but connecting both cables causes the displays to reinitialize repeatedly.
- EDID from Overrides_Catalina10.15.1 contains my notes about the override files - comparisons between EDIDs for dual cable displays (DP1, DP2, overlay, patches).
- edid-decode_joevt is a modified version of https://git.linuxtv.org/edid-decode.git/ contains some additions and fixes
- EDIDUtil.sh is a script containing shell functions to work with EDIDs. Use the source command to load it. It should work in zsh (default shell for Catalina) and bash (Mojave and earlier) but I haven't tried it with bash recently. Examples for using it are in the other folders.

Use BBEdit to examine and use the worksheet files.
 

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  • EDIDs4.0.zip
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I tried the included file but it would just turn the display on and off like you experienced on the Acer. It also did the same for other connected displays, so I had to boot into recovery mode to delete the file again.
 
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I tried the included file but it would just turn the display on and off like you experienced on the Acer. It also did the same for other connected displays, so I had to boot into recovery mode to delete the file again.
Which OS are you running? What other displays were you running?
You should be able to disconnect one of the cables to the UP3218K and wait a few seconds for the system to start working again without restarting. I guess I should try the Apple Pro Display XDR type of mtdd for the Acer.
 
Which OS are you running? What other displays were you running?
You should be able to disconnect one of the cables to the UP3218K and wait a few seconds for the system to start working again without restarting. I guess I should try the Apple Pro Display XDR type of mtdd for the Acer.

Still running Mojave (10.14.6) and I had an 24" Apple Cinema Display connected as well.
 
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