Dell 1440P monitor only can work 5 seconds with HD5500 on Monterey

[jianzhao654]

Hey guys, I have encountered a strange question. It is my used dell monitor P2418D, which is bought from another guy. It is a 2k(2560x1440) monitor. This monitor can only work 5 seconds after I connect it to my laptop. I will give more information about my situation.

1. some information.

• Configuration: OpenCore 0.7.5
• Laptop: T450s with I5-5200U and HD5500, connect the monitor through dock station 40A2.
• connect ways: Tried HDMI or DP.
• Whatevergreen and Lilu is the latest version.

This is the config of device properties.

Here is some screenshots from hackintools.

Here is some photos of the "black screen".

As you can see, it is not really black like do not plug in charge, it has the back lights.

  2. what I have tried

• boot to windows, it is ok.
• follow the guide of dortania to config the connector type.
• tried change EFI from GitHub, do not work.
• install Mojave, do not work.
• enable HiDPI, do not work.

  3. Possibles

• My config have problem.
• My dock station work not perfect for 1440p monitor in macOS.
• The monitor was damaged in transit.

So, anyone can help me, thanks in advanced!!!