U4320Q, DDM for macOS not working

Question

DDM for Mac (version 1.50.0.0039, A00) is not working with my U4320Q via USB-C on MacMini M1.

U4320Q has been upgraded to M2T104. DDC/CI is enabled.

DDM for Windows works fine with the same monitor.

On DDM for macOS, U4320Q is listed under "Compatible Systems", but not under "Applies To".

DDM Diagnostics Report as follows:

2021-10-01 11:45:01.311 DEBUG -[AppDelegate applicationDidFinishLaunching:]:204 - ======DDM Start Launching=======
2021-10-01 11:45:01.455 DEBUG -[AppDelegate applicationDidFinishLaunching:]:275 - Set AutoLaunch to 1 Good
2021-10-01 11:45:02.750 DEBUG -[AppDelegate checkNewVersionWithNotification:]:4662 - DDM Newest version = 1.50.0.0039 ; Current version = 1.50.0.0039
2021-10-01 11:45:02.751 DEBUG -[AppDelegate checkNewVersionWithNotification:]:4676 - DDM is up-to-date
2021-10-01 11:45:02.767 DEBUG -[AppDelegate GetDisplayInfo]:3515 - GetDisplayInfo NOT in MainThread
2021-10-01 11:45:02.888 DEBUG -[USBSDK init]: 47 - USB SDK Version = 320
2021-10-01 11:45:04.704 DEBUG -[USBSDK init]:148 - USB ConnectMonitorEx(0) failed.
2021-10-01 11:45:04.705 DEBUG -[USBSDK init]:191 - No USBPassthrough displays available
2021-10-01 11:45:04.705 DEBUG -[DDCCtl LoadUSBDisplays]:740 - SDK not ready
2021-10-01 11:45:04.707 DEBUG -[AppDelegate DisplaySettingChange:]:629 - ====DisplaySettingChange From USBDeviceMathcingCallback====
2021-10-01 11:45:04.708 DEBUG -[AppDelegate DisplaySettingChange:]:631 - Querying Display Information in first launch. Returned.
2021-10-01 11:45:05.590 DEBUG -[AppDelegate DDM_ini]:1589 - DDM_ini queryingDisplayInfo = 1
2021-10-01 11:45:05.590 DEBUG -[AppDelegate InitUI]:1774 - InitUI
2021-10-01 11:45:05.590 DEBUG -[AppDelegate InitUI]:1775 - pending operation count = 0
2021-10-01 11:45:05.591 DEBUG -[AppDelegate InitUI]:1808 - External display not found

DELL-Chris M · Accepted Answer

The U4320Q driver page now has a M2T105 firmware update for macOS. Give it a shot. IGNORE the file names on the driver pages. They are incorrect. I have changed mine below for clarity.

Before installing any U4320Q firmware =
* Turn off all non-essential software (Dell Display Manager, Steam, AntiVirus, Teams, Zoom, Discord, etc.)
* If connected via DP or HDMI cable, connect the USB upstream cable from the monitor to the PC

macOS firmware M2T105
File ending in 3THYP
11/2/2021
13.31MB

macOS firmware M2T104 version 2
File ending in CJT81
10/26/2021
14.2MB

macOS firmware M2T104 version 1
File ending in Y049G
9/21/2021
14.15MB

DELL-Chris M · Answer

Based on other user reports, we now know that the beta macOS Monterey is not supported by the first version (1.50.0.0039) of DDM for macOS.

So what macOS version are you running on what specific Apple PC?

WM-B · Answer

I am running macOS Big Sur 11.5.1 on a Mac mini with Apple M1 Chip, 8GB Memory.

Archipiel · Answer

I have the same problem as you. DDM runs fine on Windows PC but my DDM on my Mac Air can't find a supported monitor (although in Displays the Mac knows what it is).

Firmware upgrade done to M2T104, DDC/CI is on

WM-B · Answer

Thanks! Good to know it's not just me. Hopefully, Dell will figure this one out.

Blacktip · Answer

One more to add to the list. M1 MacBook Pro, macOS 11.6, firmware is M2T104 & DDC/CO is enabled.

Anders Pier · Answer

One more MAC Mini M1, with Dell U4320Q not working (latest OS 11.x updates + Firmware M2T104).

Same monitor works from DDM@Windows 10 & works from my Macbook Pro Early 2015 (Intel Chipset) with Mojave.

DELL-Chris M · Answer

All, there might be a DDM for macOS update tomorrow. Right click the DDM shortcut icon, look for 'Check for new version'.

TheBuddhaSmiled · Answer

On the U4320Q as well, connected to a Mac M1 Mini via USB-C. Updated to the newest DDM version (checking for a new version confirms latest version installed) and still get the same error message - asking to Connect USB-C or USB-B monitor, turn on DDC/CI, or update firmware....

Anders Pier · Answer

Same here. Mac Mini M1 with Dell U4320Q - still not working with version DDMv1.50.0.0040 and OSX 11.6, Big Sur...

WM-B · Answer

@DELL-Chris M Bumping up this issue for your attention.

The latest DMM release for MacOS (v1.50.0.0040, released two days ago) does not fix this issue.

Also, please note that the Drivers section for the U4320Q only shows the prior version of DDM for MacOS.

DELL-Chris M · Answer

The latest DMM release for MacOS (v1.50.0.0040, released two days ago) does not fix this issue. * Noted. Email sent to the team. * For testing purpose only, in addition to the USB Type-C to C cable, connect the provided USB Type-A to USB Type-C cable from the U4320Q bottom USB Type-A port to a second USB Type-C port on the Apple PC. Then retest DDM. Also, please note that the Drivers section for the U4320Q only shows the prior version of DDM for MacOS.* We know this. The drivers page is only updated per schedule. That is why I posted the instructions above to update from within 0039.* All, macOS Monterey is not supported.

WM-B · Answer

@DELL-Chris M: I just ran the new firmware update (Oct 26). DDM now works on MacOS - great news, and thanks for your help! I will mark this one as 'Solved'.

DELL-Cares · Answer

Hi,   I'm happy to know the issue is resolved.    Is there anything else I can help you with? Feel free to reach out to us, we are here to help.   Regards

Monitors

U4320Q, DDM for macOS not working

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