Macbook Pro 2019 is unable to detect more than 1 monitor

displaydockhdmimacbook pro

I have two Dell monitors and have bought Honeywell Dock to connect my MacBook to those two monitors

I connected one monitor to my Dock using VGA and another monitor to my dock using HDMI.

When I open up the Macbook Lid, it shows that it has detected only two monitors and it is treating both of my Dell monitors as one.

When I close up my Macbook Lid, the screen is seen in both of my Dell monitors and I am unable to stop the mirroring.

Need help

Best Answer

actually your Macbook Pro does not support more than 1 5k display. just check the resolution and get back to me.

Related Solutions

Macbook pro latest retina: Output to monitor with VGA

You can connect the Thunderbolt port to a VGA adapter for your VGA monitor.
I'm pretty sure it does not matter. I'm not sure if a simple HDMI-to-VGA adapter even exists.
The Macbook Retina that I have has 2 thunderbolt ports and one normal-size HDMI port.

This MacRumors topic contains some useful info as well: http://forums.macrumors.com/showthread.php?t=1426993

MacBook – rMBP kernel_task spikes when connecting more than one external monitor

According to Rhys Oxenhams:

the kernel will keep looping some very simple tasks, e.g. getting the date, therefore ‘consuming’ (with the highest priority) the majority of the CPU in a bid to cool the system down.

The solution he mentions on his blog should work for earlier Macs. For Ivy-Bridge Macs and a little earlier Richard Schwarting has found the appropriate file to disable. Instructions are included below for convenience. I have tried many things, but this works.

Disable kext by renaming it

cd /System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/Plugins
sudo mv X86PlatformShim.kext X86PlatformShim.kext.disabled

Clear kext cache (not sure if this is needed)
```
sudo touch /System/Library/Extensions/
```
Restart
```
sudo reboot
```

After installing OSX updates you may need to repeat the above procedure if the updates have re-created the kext.

Update for (High) Sierra:

TL:TR

Rename IOPlatformPluginFamily.kext/ACPI_SMC_PlatformPlugin.kext/[MacModelIdentifier].plist

Step by step:

Start intro Recovery Mode (press CMD + R while startup)
Utility > Terminal csrutil disable (Disable system file protection)
Restart and rename /System/Library/Extensions/IOPlatformPluginFamily.kext/Contents/PlugIns/ACPI_SMC_PlatformPlugin.kext/Contents/Resources/[MacModelIdentifier].plist (Mac > About > System Report > Model Identifier) to bugfix.plist (or something else)
Restart and check if kernal_task process is down below 10%
If successful restart again in Recovery Mode and enable system protaction again with csrutil enable

Tested and worked for me at 10.13.2 on Early 2011 MacbookPro.

Source with pictures (german) http://www.couchpiratin.de/mac-zu-langsam-kernel_task-cpu-fehler-beseitigen/