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Dell Precision 5510: Unable to use 4k built-in screen


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Hello Jake Lo,
I have now purchased a Precision 5510.
This has a UHD display.
With a monitor connected to HDMI, I was able to use your EFI at:



Install Big Sur.
I am thrilled how well everything works. I'm going to add a DW1830.
Unfortunately, I can not get the int. 4k display to run.
Can you give me a tip?


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Under DeviceProperties/PciRoot(0x0)/Pci(0x2,0x0), add a new value data 

AAPL00,override-no-connect = (data)

00FFFFFF FFFFFF00 4D103E14 00000000 28190104 A5231378 0EC391A8 5434B925 0C4D5300 00000101 01010101 01010101 01010101 01014DD0 00A0F070 3E803020 35005AC2 10000018 00000000 00000000 00000000 00000000 00000000 00FE0037 50485054 824C5131 35364431 00000000 00024103 28001200 000B010A 20200077 


You might want to edit on an USB and boot from that incase it doesn't work

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Thanks for the support.
I had already tried inserting the hex string.
Unfortunately without success.
I made the entry and of course nvreset (several times).
When I start without ext. monitor, now the int. screen stays on and shows the text outputs. After some time it darkens, but does not switch to graphics mode.
If I plug in the ext. monitor, the int. screen switches off and the login screen appears on the ext. display.
So it has already changed a bit. 


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dxdiag shows 128Mb.



i copied the directory /System/Library/Displays to the directory /Library/Displays.
In /Library/Displays/Contents/Resources/Overrides/DisplayVendorID-4d10 I copied the attached file.
Now two monitors are displayed, but the int. one remains dark. The backlight on the int. can even be controlled. Also with the keys.

Bildschirmfoto 2021-08-24 um 11.28.14.png


I also tried to create an appropriate configuration with the Hackintool. Unfortunately without success

is there another way to see how much RAM has been reserved for DVMT?

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