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Can't get both 4k60hz and hdmi audio work on nuc7i5bnh.

Joined
Feb 16, 2021
Messages
6
Motherboard
nuc7i5bnh
CPU
i5 7260U
Graphics
Intel Iris Plus Graphics 640
Mobile Phone
  1. Android
After installing Catalina on my Nuc7, HDMI audio doesn't work, so I need to specify IGPU and fake sound card ID, but if I do so I will lose my 4K60Hz. What should I do?
4k30hz.png
4k60hz.png
 
Joined
Feb 16, 2021
Messages
6
Motherboard
nuc7i5bnh
CPU
i5 7260U
Graphics
Intel Iris Plus Graphics 640
Mobile Phone
  1. Android
I do not need to specify the igpu model or device-id to use 4k60hz, but if I specify iris plus 640, which is the model I currently using, it will be limited to 4k30hz. please help me.
 

Edhawk

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Joined
Aug 2, 2013
Messages
2,493
Motherboard
Gigabyte Z97X-UD5H
CPU
i7-4790K
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HD 4600 / RX 580
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Mobile Phone
  1. iOS
This may be a limitation of the NUC's HDMI port, although saying that is says it is 'HDMI 2.0a' so it should be able to provide the 4K @ 60Hz resolution without issues. The NUC's specification page is a little short on resolution limits - https://ark.intel.com/content/www/us/en/ark/products/95067/intel-nuc-kit-nuc7i5bnh.html

It could be an issue with AppleALC.kext &/or WhateverGreen.kext. I assume you are using the most recent releases of the two kexts and Lilu.kext.

Have you tried using this resolution and HDMI audio with a Linux live distro or with Windows to see if it is a limitation of the NUC?

Have you tried using the USB-Type C (DisplayPort 1.2) connector instead of the HDMI, you may need an adapter if your display only has a HDMI connection. It should provide 4K resolution and audio but whether it can do so at 60Hz is another matter.
 
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