Difficulty getting dual monitor + mac mini + kvm setup working. All devices detected but only one screen rendering.

So this is the setup I am trying to make work here, or at least the last iteration of the setup


      ┌────────────────────┐      ┌────────────────────┐
      │   Alienware Monitor│      │    Dell Monitor    │
      │    (AW3821DW)      │      │    (S2721HSX)      │
      └────────────────────┘      └────────────────────┘
    DisplayPort to HDMI             HDMI Cable                    
            Cable                       │                          
              │                         │                         
              ▼                         ▼                         
           ┌────────────────────────────────┐   
           │                  KVM Switch    │                   
           └───┬────────────────┬───────────┘   
               │                │                                    
               │                │                                     
       HDMI Cable           HDMI Cable                            
               │                │                                    
               │                │                                    
               │                │                                    
               │                │                                    
        HDMI to Thunderbolt     │
        Adapter                 │
               │                │                                    
               ▼                ▼                                     
            ┌─────────────────────┐                            
            │          Mac        │                            
            │          Mini       │                           
            └─────────────────────┘                                           



What seems to be happening is


The Dell connected via the plain jane HDMI cords work fine. The monitor is detected and renders a display.


The Alienware monitor on the other hand appears to be somewhat detected, as in the system setting will detect some sort of display device but without the model name or any resolution options that make any sense.


I can move my mouse off screen.


I have tried to reset the mac mini


I have tried reseting the alienware monitor


I have doubnle checked the input selector (it is set to the display port output)


I have cycled the KVM


I have checked all connections and tired replacement wires


I am at my wits end here and before I start going off buying more fancy wires I was hoping to someone in the community could help me better understand whats going on here, or help me pick out the correct setup/wires/hub to make this work.


Thanks and Cheers!


Here are the monitor model numbers and mac mini specs


Mac Mini M2

one HDMI port two thunder ports


Main

alienware aw3821dw (this one doesn't seem to recognize the incoming signal)


Secondary (this one renders fine)

dell monitor s2721hsx






Mac mini, macOS 14.5

Posted on Aug 10, 2024 4:43 PM

Reply
Question marked as Top-ranking reply

Posted on Aug 10, 2024 7:57 PM

Mac's do not like large high resolution displays on long cheap cables, cheap adapters, cheap docks or KVM switches.


Ditch the KVM switch.


Hook the Dell directly up the the Mac Mini's HDMI port using a short 1 meter high speed HDMI cable.

for example > https://www.amazon.com/dp/B08M9HND4F/ref=sspa_dk_detail_0?


Then hook the Alienware directly up to the Mac mini using a short 1 meter high speed TB/USB-C to DisplayPort cable.

for example > https://www.amazon.com/dp/B09M3BFHPP/ref=sspa_dk_detail_2?


For more info on connecting displays to the Mac mini, see > Connect a display to Mac mini - Apple Support

Similar questions

1 reply
Question marked as Top-ranking reply

Aug 10, 2024 7:57 PM in response to sparrow412

Mac's do not like large high resolution displays on long cheap cables, cheap adapters, cheap docks or KVM switches.


Ditch the KVM switch.


Hook the Dell directly up the the Mac Mini's HDMI port using a short 1 meter high speed HDMI cable.

for example > https://www.amazon.com/dp/B08M9HND4F/ref=sspa_dk_detail_0?


Then hook the Alienware directly up to the Mac mini using a short 1 meter high speed TB/USB-C to DisplayPort cable.

for example > https://www.amazon.com/dp/B09M3BFHPP/ref=sspa_dk_detail_2?


For more info on connecting displays to the Mac mini, see > Connect a display to Mac mini - Apple Support

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Difficulty getting dual monitor + mac mini + kvm setup working. All devices detected but only one screen rendering.

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.