Dell D3100 Dual 1440p Monitors

[rboerner]

Originally Posted by conorlap

Hi thanks for your comment. Yeah I'd seen that, but it states the maximum resolution is 2048x1152 only when two HDMI outputs are connected. The way I've got it setup is 1 monitor is connected via Displayport and the other monitor is connected via HDMI.

The Dell table states that the HDMI outputs can output to a single display at 2560x1440 resolution, but at a maximum 50Hz refresh rate (which is lower than the typical 60Hz).

Looking at page 18 (printed page 8) of the manual for your display (https://www.acer.com/ac/en/US/conten...oduct/5218?b=1) , there is no EDID timing for 2560x1440@50Hz, but rather only support for 2560x1440@60Hz (screenshot attached).

The absence of this timing mode is most likely why the display is dropping down to a lower resolution.

[conorlap]

Originally Posted by rboerner

The Dell table states that the HDMI outputs can output to a single display at 2560x1440 resolution, but at a maximum 50Hz refresh rate (which is lower than the typical 60Hz).

Looking at page 18 (printed page 8) of the manual for your display (https://www.acer.com/ac/en/US/conten...oduct/5218?b=1) , there is no EDID timing for 2560x1440@50Hz, but rather only support for 2560x1440@60Hz (screenshot attached).

The absence of this timing mode is most likely why the display is dropping down to a lower resolution.

Hmmm good research - but both monitors work fine through the D3100 when I use a Windows 8 laptop, so it seems like some MacOS compatibility issue unfortunately. I've emailed Displaylink support with the info and logs to see if this can be solved. In the meantime I'll use the HDMI out on my Macbook for the second monitor! Thanks for your input

[rboerner]

Originally Posted by conorlap

Hmmm good research - but both monitors work fine through the D3100 when I use a Windows 8 laptop, so it seems like some MacOS compatibility issue unfortunately. I've emailed Displaylink support with the info and logs to see if this can be solved. In the meantime I'll use the HDMI out on my Macbook for the second monitor! Thanks for your input

If you have had success with the same physical setup using Windows, if you have not already you may want to try the procedure described here --> https://support.displaylink.com/know...-not-available to see if that allows you to manually specify the resolution of the display within macOS.

[conorlap]

Originally Posted by rboerner

If you have had success with the same physical setup using Windows, if you have not already you may want to try the procedure described here --> https://support.displaylink.com/know...-not-available to see if that allows you to manually specify the resolution of the display within macOS.

Yeah I've tried that also but still no luck!

[conorlap]

UPDATE: Displaylink driver 5.2.1 Beta has fixed this problem! 🥳🥳