[akras97]

Hello everyone,

I am facing issues with my Dell D6000S dock when trying to use a 4K monitor over DisplayPort. The problem occurs both on my MacBook Pro 13" (A2251, Intel, 2020) and my work laptop HP EliteBook 845 G8 (Windows 11, AMD Ryzen).

Setup
Dock: Dell D6000S (latest firmware installed)
Host 1 (personal): MacBook Pro A2251 (Intel, 2020, macOS [insert version])
Host 2 (work): HP EliteBook 845 G8 (Windows 11, AMD Ryzen)
DisplayLink Manager (macOS): latest version installed, allowed in System Preferences → Security & Privacy → Screen Recording

Monitors:
1× 4K monitor (with HDMI & DisplayPort input)
1× 1080p monitor (HDMI only)

The problem:
If I connect the 4K monitor via DisplayPort (either DP1 or DP2) → the screen stays black.
It briefly appears in the OS (macOS/Windows) and in DisplayLink Manager, but disappears again.
If I connect the 4K monitor via HDMI, it works fine.
The 1080p monitor via HDMI also works fine.

When trying HDMI (1080p) + DP2 (4K) together:
Only the HDMI screen works → the 4K screen remains black.
Important: This happens both on macOS and on Windows (HP EliteBook).

What I have tried:
Updated Dell D6000S firmware.
Installed the latest DisplayLink Manager on macOS.
On Windows: installed the latest DisplayLink drivers.
Verified permissions (macOS: Screen Recording enabled).
Tested both DP ports, HDMI, and mixed combinations.
Swapped cables (HDMI, DP).
Tried forcing custom resolutions (3840×2160 @ 60 Hz) using BetterDisplay on macOS.
The 4K monitor works fine over HDMI, but not over DisplayPort from the dock.

My current goal is simple:
When I connect my MacBook Pro via USB-C, I want both monitors (4K + 1080p) to be detected as separate extended displays (not mirrored).
When I connect my work HP EliteBook, the exact same thing should happen: both monitors detected and working as separate extended displays.
In other words: one cable in, two extended monitors active – no matter if it’s my MacBook or my HP laptop.

Has anyone else experienced this with D6000S + 4K over DisplayPort (on either macOS or Windows)?
Is there a known fix or workaround ?
Could this be a limitation or defect of the D6000S?
Any help would be greatly appreciated.

Best regards,

Albert