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Can't get High Resolution using Dell u4919dw Ultrawide on 2018 Mac Mini?

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Posted · Original PosterOP

Hi Everyone! I just purchased a Dell Ultrawide U4919DW and a 2018 Mac Mini and for some reason the best resolution I can get is is 3840x1080.  I should be able to get 5120x1440 native resolution as both the Monitor and the Mac Mini support this. 


I have tried connecting by the included Dell-included USB-C Cable and the Dell-included HDMI Cable,  but there's no improvement.  In fact,  I think the HDMI cable may provide a lower refresh rate but I can't really tell.


I tried connecting the Monitor to my 3 year old PC Via Display Port cable and I get the high res 5120x1440 mode - Just not on the Mac Mini. 


The Mac Mini Display Properties does NOT show a resolution setting to me.  Instead my choice is "default" and "scaled".  If I hold down the option key and click scaled I can see that the resolution only goes as high as 3840x1080.  


I talked to Apple support and they have opened a case for me.  They were very nice and spent about 25 minutes testing a few things.  They were great.  I called Dell and, well, lets just say it wasn't the best tech support call I've ever had... 


Anyway, if anyone has a similar setup and knows what I need to get this working right I'd love some advice. Thanks in advance! 



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From what I can tell on dells webpage they say you need to have HDMI 2.0a while the mac mini only has HDMI 2.0. I am unsure if this is an issue because from my knowledge usually HDMI 2.0 is enough for 4k 60 but not HDR and using 2.0 usually still works but HDR just won't function. 5120x1440 is less pixels than 4k by a slight amount so I would assume the same would apply. Anyways bottom line is that HDMI 2.0a is required based on sells website while the mac mini only has HDMI 2.0

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Posted · Original PosterOP

Hi Supa - 

Thanks for the suggestion,  but does using this method impede performance such as reduce the refresh rate? 


Hi Brooksie359, 

Thanks I will try this too,  though I would think that the HDMI cable provided by Dell with the monitor would be HDMI2.0a would it not? I can't imagine anyone selling a monitor with lots of bells and whistles, but not including a proper cable to support it. 

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Posted · Original PosterOP


By the way, I came up with a temporary fix.  A DUMB temporary fix, but it is what it is. 


The Dell U4919DW monitor can actually function as 2 separate monitors,  and the Mac Mini supports multiple monitors.  So check this out: I connected both a USB-C Cable AND and the HDMI cable, from the Mac Mini to the Dell Monitor.  And after a couple of minutes of messing around, I actually got it to work. 


The Mac Mini is in dual monitor / extended desktop mode. Essentially, it is running as dual 2560x1440 monitors! 


This is kinda cool, and kinda frustrating at the same time.   

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