Second HDMI display detected by macOS but receives no signal — ORICO DPL12
 

Hello DisplayLink Support,

I need help with a dual-monitor issue on macOS.

Both external monitors are connected to my ORICO DPL12 docking station, using one monitor on each HDMI output. macOS and DisplayLink Manager detect both LG monitors, but only one monitor actually displays an image.

The second monitor remains off or in standby because it receives no HDMI signal, even though macOS reports it as online.

This setup previously worked correctly, with both external monitors displaying an extended desktop.

System configuration:

Mac: MacBook Pro
Model Identifier: Mac14,7
Processor: Apple M2, 8-core CPU
GPU: Apple M2, 10-core GPU
Memory: 16 GB
macOS: 26.6.2, build 25G83
DisplayLink Manager: 16.2.39
Architecture: Apple Silicon / ARM64

Docking station:

Product: ORICO 12-in-1 Docking Station
Model: DPL12 / ORICO-DPL12
Manufacturer: ORICO Technologies Co., Ltd.
Product page: https://orico.cc/index/product/detail/3430.html
Connection to Mac: USB-C
Video connection: one monitor connected to each HDMI output
Dock identification reported by macOS:
USB product name: Subosen_3900_Docking
USB manufacturer: DisplayLink
USB Vendor ID: 0x17e9
USB Product ID: 0x4307
USB link speed: 5 Gbps

Displays:

Two LG FULL HD monitors
Product identification reported by macOS: GSM5B55
Resolution: 1920 × 1080
Refresh rate: 60 Hz
Display mode: extended desktop
Mirroring: disabled

What macOS and DisplayLink Manager report:

Built-in MacBook display: online
First LG FULL HD display: online
Second LG FULL HD display: online

DisplayLink Manager shows both external displays as enabled
However, this logical detection does not match the physical result:

First LG monitor: working and displaying an image
Second LG monitor: receives no HDMI signal and remains off or in standby

The DisplayLink Support Tool archive was generated while both HDMI cables were connected and while the second monitor was receiving no signal. Therefore, the archive represents the faulty state, even though its display report lists both external monitors as online.

Could you please advise:

Why can macOS and DisplayLink Manager report both displays as online while one physical HDMI output provides no signal?

Is this a known issue with DisplayLink Manager 16.2.39 and macOS 26.6.2?

Is there another DisplayLink Manager version or beta build that I should test?

Are there any additional logs or tests that would help determine whether this is a DisplayLink software issue or a problem with one of the dock’s HDMI outputs?

I have the complete DisplayLink Support Tool ZIP generated while the problem was present and can attach it or provide it through a private or secure channel.

Thank you for your help.

Hello,

Thank you for your contact.

Did you check using monitor's OSD menu whether video input is set to HDMI?
Does swapping display 1 & 2 makes any difference?

Regards,
Szymon