UP3218K only runs at 4k

[joevt]

Hi, Thanks for taking a look. I've attached below new EDID with both DisplayPort cables connected, switch res only gave me the option to export EDID on the first monitor but I'm presuming its included the information in this file.
Also attached below screen grabs of the two resolutions I can get with 30Hz and 60Hz.

I will take a look at those files you have mentioned but I'm not very experienced in modifying files for displays. Attached below those files you mentioned. There was a "DisplayProductID-4147" file in there already - what parameters do you think I should try? Thanks!

The DELL UP3218K_2xDP.txt file contains the same EDID information as the previous DELL UP3218K.txt file except the new file contains a new block added by SwitchRes X for a new resolution 7680 x 4320 @ 24 Hz. I don't know why that's there since it's the same as the Detailed Timing #2 in the previous block (except the previous block had version 1.2 and the new block has version 1.1).

The screenshot showing the timing information for the 6720 x 3780 @ 60 Hz resolution shows why people should not trust the information from System Information.app. The timing information shows the resolution used is only 3840 x 2160 @ 60 Hz (like I've said before, framebuffer resolution ≠ display resolution). Apple needs to modify System Information.app to show Display Resolution - the Resolution should be renamed Framebuffer Resolution.

The DisplayProductID-4147 file is modified by SwitchResX to include the new scaled resolution that you added and the modified EDID that I described above. The file includes a backup of the original file so that SwitchResX can revert its changes.

try the following:
Remove "DisplayProductID-4147" and restart. Redo screen shots and EDID. Post screen shots and EDID's that differ.

You say the second display didn't show an Export EDID button? Post a screenshot of the SwitchRes X "Display Information" tab for each display.

Install the attached mtdd file. The overlay uses the EDID created by SwitchRes X. The other fields I set according to the resolution and Product ID of the 8K display. The EDID may need to be modified. In that case I'll need to extract the overlay from the 5K display, convert to binary, and check it with a different EDID dumping program to see what differs from the real EDID of the display and the EDID of the 8K display.

 

[joevt]

Oh, one more observation, the screenshot showing the 7680 x 3840 @ 30 Hz resolution is interesting because it shows a pixel clock of 1030.25 MHz which is the greatest I've seen. My Dell 5K display shows 966.50 MHz but that is from two cables probably running at only 483.25 MHz which is less than the usually 4K 60 Hz timing of 533 MHz (HDMI).

 

[joetazz]

The DELL UP3218K_2xDP.txt file contains the same EDID information as the previous DELL UP3218K.txt file except the new file contains a new block added by SwitchRes X for a new resolution 7680 x 4320 @ 24 Hz. I don't know why that's there since it's the same as the Detailed Timing #2 in the previous block (except the previous block had version 1.2 and the new block has version 1.1).

The screenshot showing the timing information for the 6720 x 3780 @ 60 Hz resolution shows why people should not trust the information from System Information.app. The timing information shows the resolution used is only 3840 x 2160 @ 60 Hz (like I've said before, framebuffer resolution ≠ display resolution). Apple needs to modify System Information.app to show Display Resolution - the Resolution should be renamed Framebuffer Resolution.

The DisplayProductID-4147 file is modified by SwitchResX to include the new scaled resolution that you added and the modified EDID that I described above. The file includes a backup of the original file so that SwitchResX can revert its changes.

try the following:
Remove "DisplayProductID-4147" and restart. Redo screen shots and EDID. Post screen shots and EDID's that differ.

You say the second display didn't show an Export EDID button? Post a screenshot of the SwitchRes X "Display Information" tab for each display.

Install the attached mtdd file. The overlay uses the EDID created by SwitchRes X. The other fields I set according to the resolution and Product ID of the 8K display. The EDID may need to be modified. In that case I'll need to extract the overlay from the 5K display, convert to binary, and check it with a different EDID dumping program to see what differs from the real EDID of the display and the EDID of the 8K display.

Hi, ah interesting. I've attached below screenshots and EDID after deleting the "DisplayProductID-4147" and restart.

Also tried installing the file you attached, and restarted with the same resolutions.

I know that with Windows you have to install a driver/software to get 7680 x 4320 @ 60 Hz, Im presuming this merges or tiles the two outputs. Would that be possible to recreate for Mac?

Thanks again!

 

[joetazz]

Something else that's interesting after installing your file -

If I change the outputs to a few of the lower resolution settings at 60hz, it gives the below result, two separate tiled desktops but it seems to have attempted to merge the two outputs!

It seems the hardware is working properly as I am seeing 2 x 3840 x 4320 @ 60 Hz on the monitor. Maybe there is a piece of software that can keep this dual output resolution but trick Mac into thinking its a single output?

 

[joevt]

I know that with Windows you have to install a driver/software to get 7680 x 4320 @ 60 Hz, Im presuming this merges or tiles the two outputs. Would that be possible to recreate for Mac?

We are assuming that the existing drivers will work with these modified files. If it was that simple then Apple would have done it but they have been known not to do things...

If I change the outputs to a few of the lower resolution settings at 60hz, it gives the below result, two separate tiled desktops but it seems to have attempted to merge the two outputs!

It seems the hardware is working properly as I am seeing 2 x 3840 x 4320 @ 60 Hz on the monitor. Maybe there is a piece of software that can keep this dual output resolution but trick Mac into thinking its a single output?

Are you saying that you haven't seen 2 x 3840 x 4320 @ 60 Hz before in macOS?

Try this attached file. It is a duplicate of the Dell 5K file. Maybe it will show a dual cable 5K resolution.

 

[joetazz]

Are you saying that you haven't seen 2 x 3840 x 4320 @ 60 Hz before in macOS?

Not on the same screen at the same time, something in the file you sent must have enabled it.

At the moment I think I am physically seeing 7680 x 4320 @ 60hz as its split into two desktops on the same monitor. On my last post the first attachment shows a photo of the monitor with 3840 x 4320 @ 60 Hz tiled on the left and 3840 x 4320 @ 60 Hz tiled on the right. So visually creating 7680 x 4320 @ 60hz. Confused!

Installed Dell 5K file, seems to give same resolutions/results.

EDIT - ok so when I take a screenshot of the full screen it is making 2x 3840 × 4320 files.

 

[dreamxstudio]

Hi, sorry to check out late.
Great work! I'll reply more when finished reading all your progress.

 

[dreamxstudio]

Not on the same screen at the same time, something in the file you sent must have enabled it.

At the moment I think I am physically seeing 7680 x 4320 @ 60hz as its split into two desktops on the same monitor. On my last post the first attachment shows a photo of the monitor with 3840 x 4320 @ 60 Hz tiled on the left and 3840 x 4320 @ 60 Hz tiled on the right. So visually creating 7680 x 4320 @ 60hz. Confused!

Installed Dell 5K file, seems to give same resolutions/results.

EDIT - ok so when I take a screenshot of the full screen it is making 2x 3840 × 4320 files.

Have u tried enable MST support in your Clover config? like agdpmod=pikera
If enabled u will have 5k support with 2715k.
I strongly doubt that 8k will work too.

 

[joevt]

Notes about macOS Catlina and the Apple Pro Display XDR (6K) at dell-8k-dual-displayport-1-4-monitor-on-macos-catalina

Can someone with an 8K display run the following command and post the output?

/System/Library/Extensions/AppleGraphicsControl.kext/Contents/MacOS/AGDCDiagnose -a > AGDCDiagnose_a.txt 2>&1

 

[UniqueNameIdentifier]

Notes about macOS Catlina and the Apple Pro Display XDR (6K) at dell-8k-dual-displayport-1-4-monitor-on-macos-catalina

Can someone with an 8K display run the following command and post the output?

/System/Library/Extensions/AppleGraphicsControl.kext/Contents/MacOS/AGDCDiagnose -a > AGDCDiagnose_a.txt 2>&1

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).