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hiDPI custom resolutions macOS Big Sur Apple Silicon

Joined
May 19, 2017
Messages
73
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Gigabyte Z97-d3h
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i5-4950
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AMD Vega 64
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I'm plugging my late 2020 M1 MacBook Air into the following 21:9 1440p monitor over USB-C - https://www.lg.com/us/monitors/lg-35wn75c-b-ultrawide-monitor. There are no hiDPI resolutions available to select in displays or using RDM. I downloaded SwitchResX and tried to set some custom resolutions as seen in the following screenshot but they are called invalid. Some advice here would be greatly appreciated.
 

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Joined
Oct 15, 2011
Messages
965
Motherboard
ASUS Gryphon Z87
CPU
i7-4770K
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HD 4600 & RX 580
Mac
  1. MacBook Pro
  2. Mac mini
Classic Mac
  1. Apple
which resolutions are shown in system preference ? I am also planing to get an M1 but with a 32:9 Screen (5120x1440)
 
Joined
Nov 12, 2018
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55
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Asus ROG Maximus X Hero Gaming Z370
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i7-8700K
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  2. MacBook Pro
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  1. iOS
Doesn't work at all. Had contact with Stephane from SwitchResX, currently there seems no way to run any other modes like the provided ones. There some people more, but it seems like no one is interested enough to bug Apple about it. So I think that behaviour will never change. It's really annoying.
 
Joined
Oct 15, 2011
Messages
965
Motherboard
ASUS Gryphon Z87
CPU
i7-4770K
Graphics
HD 4600 & RX 580
Mac
  1. MacBook Pro
  2. Mac mini
Classic Mac
  1. Apple
Doesn't work at all. Had contact with Stephane from SwitchResX, currently there seems no way to run any other modes like the provided ones. There some people more, but it seems like no one is interested enough to bug Apple about it. So I think that behaviour will never change. It's really annoying.
What does than mean ? Does it mean that you cant run a screen with 5120x1440 ?
 
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