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Wrong default resolution - ultra widescreen (5120x1440)

Joined
Nov 16, 2017
Messages
15
Motherboard
Gigabyte Z390 DESIGNARE
CPU
i9-9900K
Graphics
RTX 2080 | RX 580 | UHD 630
Mac
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  2. MacBook Pro
Classic Mac
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  3. SE
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Hello folks,

I'm currently trying to make my Big Sur Installation to work properly. The installation went till now pretty smoothly (Thanks to Casey's famous guide for the Designare Z390).
Unfortunately I do have a bigger problem with my Samsung C49RG9x monitor. In Mojave everything works as expected (the default resolution is set to 5120x1440), but in Big Sur the default resolution is always set to 2560x720 (all monitor elements are scaled by two, the output resolution seems to be 5120x1440 tho). The display is connected via Displayport.
To fix this i tried to choose a scaled option in macos' display preferences (the option 5120x1440 is present). Using this scaled option does unfortunately not effect the boot logo in the second phase and especially does not effect the login screen.

Has anyone an idea how to fix this? Thanks for your help!
 
Joined
Dec 21, 2020
Messages
7
Motherboard
H370-I
CPU
I5 8400
Graphics
iGPU
you found a solution ? have same problem
 

beelzebozo

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Joined
Mar 31, 2010
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ASUS z170-Deluxe
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i7 - 6700K
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RX 5700 XT
Mac
  1. iMac
Classic Mac
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Mobile Phone
  1. iOS
I think it’s a bug in Big Sur. I have two display port monitors, different models and they are shown as matching displays which is incorrect. My main 1440p display shows as 1080p and I can’t change the resolution to 2560x1440.
 
Joined
Dec 21, 2020
Messages
7
Motherboard
H370-I
CPU
I5 8400
Graphics
iGPU
At me 5120x1440 native work but Ui resolution is only at UHD how can fix that? so text etc is very blurred very bad
 
Joined
Jan 5, 2022
Messages
8
Motherboard
Asus ROG Strix Z490-G Gaming-2301
CPU
i7-10700K
Graphics
UHD 630
Anyone have anyluck with getting 5120x1440 resolution from the UHD630?
 
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