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lethargos Author

Level 1

17 points

macbook pro works with dell docking station only in mirror mode

Hello,

For a few months I'm having trouble using my macbook pro 2019 13" with my dell docking station WD15 K17A (reg type no. K17A001). I can't figure out what has happened, I have the exact same operating system (macOS Catalina) on which it previously worked without any issues.

The problem is that when I connect it to my docking station, the two monitors are identified as one monitor in System Preferences and that they only work as mirrored screens. So in "Displays" I only see two monitors, the laptop's and the two which are identified as a single one.

I'm using the latest display link driver https://www.displaylink.com/downloads/macos.

I've also tried with a legacy version (just for the sake of it), but it didn't work.

Any ideas how I could solve this issue or where the problem might stem from?

MacBook Pro

Posted on Sep 14, 2020 7:38 AM

Top-ranking reply

neuroanatomist

Level 9

50,173 points

Posted on Sep 16, 2020 9:04 AM

Grant Bennet-Alder wrote:

That Dock does not really support two displays over HD resolution each.

Indeed – one display at 4K, two displays at HD. From the specs:

support for multiple displays on a single ThunderBolt-3 cable is "quirky"

I've had no issues with two external displays (along with GigE, speakers and power) connected via a single TB3 cable from my Elgato TB3 dock. But the Dell WD15 dock the OP has is not a TB3 dock.

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macbook pro works with dell docking station only in mirror mode

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