Macbook Air M1 2020 Dual Monitor Setup - Both Monitors Detected, One Blank

bnqdms · 08-22-2022, 11:14 AM

I have two external monitors I'd like to use with my Macbook Air M1 2020.

I have a Belkin Dual Display USB-C dock to plug both of these monitors into via HDMI; this is then connected to the Macbook Air via USB-C.

When connected, one monitor shows an image, the other monitor is detected but shows no image.

Hardware

Macbook Air M1 2020
Belkin INC002 USB-C Dual Display Docking Station
Benq GW2480 - this monitor works when plugged into the dock via HDMI in both single/dual monitor setup
Benq BL2485TC - this monitor does not work when plugged into the dock via HDMI in either single/dual monitor setup

Software

macOS Monterey 12.5.1
DisplayLink 1.7.1

I can get the Benq BL2485 to work if I plug the GW2480 into the dock, and use the Apple USB-C multiport adapter in the other USB-C port of the laptop. I was under the impression I'd be able to plug both screens into the Belkin dock though, so this isn't ideal.

I have tried turning everything off and on, restarting, etc. several times but this doesn't do anything.

I have tried using different HDMI cables, no difference.

The problem seems to lie between the Benq BL2485 and the Belkin dock. Has anyone had the same issue in the past? Any ideas for how to troubleshoot are welcome.

08-22-2022, 11:14 AM	#1
bnqdms Junior Member Join Date: Aug 2022 Posts: 2	Macbook Air M1 2020 Dual Monitor Setup - Both Monitors Detected, One Blank I have two external monitors I'd like to use with my Macbook Air M1 2020. I have a Belkin Dual Display USB-C dock to plug both of these monitors into via HDMI; this is then connected to the Macbook Air via USB-C. When connected, one monitor shows an image, the other monitor is detected but shows no image. Hardware Macbook Air M1 2020 Belkin INC002 USB-C Dual Display Docking Station Benq GW2480 - this monitor works when plugged into the dock via HDMI in both single/dual monitor setup Benq BL2485TC - this monitor does not work when plugged into the dock via HDMI in either single/dual monitor setup Software macOS Monterey 12.5.1 DisplayLink 1.7.1 I can get the Benq BL2485 to work if I plug the GW2480 into the dock, and use the Apple USB-C multiport adapter in the other USB-C port of the laptop. I was under the impression I'd be able to plug both screens into the Belkin dock though, so this isn't ideal. I have tried turning everything off and on, restarting, etc. several times but this doesn't do anything. I have tried using different HDMI cables, no difference. The problem seems to lie between the Benq BL2485 and the Belkin dock. Has anyone had the same issue in the past? Any ideas for how to troubleshoot are welcome.