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Dell OptiPlex 3070 with i5-9600k on macOS Monterey 12.0

Hardware Specification

ComponentSpecs
CPUIntel® Core™ i5-9600k
RAM32gb DDR4 2400MHZ
HDDSamsung EVO 970 NVMe SSD 256GB
iGPUIntel® UHD Graphics 630
AudioRRealtek ALC3234
OSmacOS Monterey 12.0 (21A5284e)
BootOpenCore 0.7.1

Working:

CPU Turbo Boost & Thermal Throttling Audio GPU All USB Ports LAN Airdrop & Airplay Sleep Internal sound and hdmi

Not working:

Display sleep (thinks it's an external monitor)

BIOS Settings

General → Advanced Boot Options: uncheck System Configuration → SATA Operation: AHCI Secure Boot → Secure Boot Enable: Disabled Intel® Software Guard Extensions™ → Intel® SGX™ Enable: Disabled Power Management → Block Sleep: check Virtualization Support → VT for Direct I/O: uncheck

BIOS Settings via GRUB (Optional)

Set Pre-Allocated DVMT to 64M: setup_var 0x8DC 0x02 Disable CFG lock: setup_var 0x5BE 0x00