HiDPI

JanB · 11-09-2021, 10:26 PM

I have now tried the "BetterDummy" program and checked whether it can provide a solution for the missing HiDPI resolutions via DisplayLink.

The good news is: Yes, it is a woraround to get HiDPI representation via DisplayLink.

My configuration:

MacBook Air M1 (clamshell mode, internal display not used)
MacOS Monterey 12.0.1
2x LG HDR 4k monitor (used @ Looks like 2560 x 1440)

Monitor # 1: connected via USB-C to display port adapter (working HiDPI @ 2560 x 1440)
Monitor # 2: connected via Display-Link Dock "Kensington SD4780P" (no HiDPI out of the box)

The Workaround for HiDPI on Monitor #2:

1.
Install and start "BetterDummy" from https://github.com/waydabber/BetterDummy/releases

2.
Create a dummy Display "16:9 (HD/4k/5k/6k)

3.
In the display properties set the "Dummy Display" to:

extended display
optimized for: Dummy 16:9
Resolution: default for display

4.
Switch Resolution of Dummy to desired HiDPI resolution (eg. 2560 x 1440) using the BetterDummy Menu: "Manage dummies" --> "Set resolution"

5.
Set your Display-Link Display in the display properties to:

mirror 16:9 dummy
optimized for: Dummy 16:9
Resolution: default for display

6.
Optional settings of BetterDummy:

associate the mirror to the pysical display
start at login
sleep workaround
details at: https://github.com/waydabber/BetterDummy

--> Now you should have a 2560 x 1440 HiDPI @ 4k

My LG HDR 4k Monitor via DisplayLink is now running @ 3840x2160/60Hz showing 2560x1440 in a crystal clear picture.

This is not a straight forward solution, but now I have two external 4k monitors on my MacBook Air M1 that work with HiDPI to my fullest satisfaction.

11-09-2021, 10:26 PM	#2
JanB Member Join Date: Apr 2021 Posts: 36	I have now tried the "BetterDummy" program and checked whether it can provide a solution for the missing HiDPI resolutions via DisplayLink. The good news is: Yes, it is a woraround to get HiDPI representation via DisplayLink. My configuration: MacBook Air M1 (clamshell mode, internal display not used) MacOS Monterey 12.0.1 2x LG HDR 4k monitor (used @ Looks like 2560 x 1440) Monitor # 1: connected via USB-C to display port adapter (working HiDPI @ 2560 x 1440) Monitor # 2: connected via Display-Link Dock "Kensington SD4780P" (no HiDPI out of the box) The Workaround for HiDPI on Monitor #2: 1. Install and start "BetterDummy" from https://github.com/waydabber/BetterDummy/releases 2. Create a dummy Display "16:9 (HD/4k/5k/6k) 3. In the display properties set the "Dummy Display" to: extended display optimized for: Dummy 16:9 Resolution: default for display 4. Switch Resolution of Dummy to desired HiDPI resolution (eg. 2560 x 1440) using the BetterDummy Menu: "Manage dummies" --> "Set resolution" 5. Set your Display-Link Display in the display properties to: mirror 16:9 dummy optimized for: Dummy 16:9 Resolution: default for display 6. Optional settings of BetterDummy: associate the mirror to the pysical display start at login sleep workaround details at: https://github.com/waydabber/BetterDummy --> Now you should have a 2560 x 1440 HiDPI @ 4k My LG HDR 4k Monitor via DisplayLink is now running @ 3840x2160/60Hz showing 2560x1440 in a crystal clear picture. This is not a straight forward solution, but now I have two external 4k monitors on my MacBook Air M1 that work with HiDPI to my fullest satisfaction. Last edited by JanB; 11-19-2021 at 02:34 PM.