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Okay, this is going to be a quick one for those who use Samsung DeX on a regular basis. There are some hidden features that are available on your device right now. I decided to separate this because this is indeed a topic on its own, despite being a short segment.

Okay, Samsung has a lot of different menus and hidden settings – just like how the “Pause USB Power Delivery” option had to be summoned by performing some ritual. The hidden settings for DeX though, is just hidden.

These are advanced beta features that are only available when we install Good Lock. If we also then install the MultiStar module, then he have something called “I Love DeX”.

Hidden Samsung DeX ultrawide high resolution feature

One setting that piqued my interest is the option to enable “high-resolution mode for external displays” for DeX. This option is… well, I think my Dell UltraSharp U4021QW is the perfect monitor to test this feature out.

This is a 4K ultrawide monitor with 21:9 aspect ratio – so 5120×2160 pixels. From the information that I can gather, it runs at 1080p by default but it fills up to that 21:9 aspect ratio.

Hidden Samsung DeX ultrawide high resolution feature

It toggles between the maximum 4K 16:9 or down to a 1080p resolution. However, since this is an ultrawide monitor, it goes up to 2560×1080 pixels. I believe this is a new feature for DeX.

Hidden Samsung DeX ultrawide high resolution feature

Then, when we enable the “high-resolution mode for external displays” option in MultiStar, it changes to the maximum resolution of 3840×2160 at 16:9 aspect ratio only. It doesn’t scale up to 5120×2160 pixels – and that is why we have black bars on both sides.

Hidden Samsung DeX ultrawide high resolution feature
This also means Samsung is using DisplayPort Alt Mode version 1.2.

Just a bit of an add-on here, if you have a 1440p ultrawide monitor like the Acer Nitro XV340CKP that I have, then you can get 3440×1440 pixels output too. That’s fantastic!

Hidden Samsung DeX ultrawide high resolution feature

As for the reason why Samsung disables this option by default, that is because of how DeX scales. This UI is made for 1080p displays only, and if we put it up on a 4K screen with the high-resolution mode enabled, then this happens. Just compare the button sizes between 1080p and 4K, and use that Dell logo as a reference.

Sadly, there is still no way to use both the external display and the tablet itself in DeX mode. It’s only the external display as DeX and the tablet in the typical tablet mode.

And that’s it. I just want to share my findings since I am one of the weird people who exclusively uses ultrawide monitors.

By the way, this option – as far as I can find out – is the same for all Samsung devices that support DeX. Whether it’s a tablet or a phone or even a foldable device – this option works the same.

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  1. Hi Kok,

    Thank you so much for your informative video and steps, love it!!

    Please keep on making such useful videos on samsung dex. I have heard that the Ultra versions support higher display count since they have more powerful GPU chipset and overall hardware. Would love you see what you can pump the resolution on one of those!

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