Default settings: iMac18,2, No GUI, No Picker, HiDPI (2x), Power Nap On

macOS Version: Big Sur 11 (Beta, 20A5364e)

This is the last update, because I have replaced the motherboard to Maximus VIII Hero (Z170 chipset).

Hardware Model
CPU i3-6100 (XCPM+HWP by CPUFriend)
GPU Intel HD Graphic 530 (no-connector, ig-platform-id: 0x19120001) + Sapphire AMD RX470D (VBIOS RX570, PCI-e Slot-1)
SSD Apple SSD SM0128G (M.2 in use)
Memory DDR4 2400 8GB (Running at 2133 MHz, BANK0/DIMM0)
Soundcard Onboard Realtek ALC1150 (alc-layout-id: 3)
Motherboard ASUS B150 PRO GAMING (Latest UEFI BIOS)
Wi-Fi Card Apple BCM943602CDP (4 antennas, 802.11a/b/g/n/ac, Simultaneous dual band (2.4GHz & 5GHz), HT80 with 3×3 MIMO, used by iMac Intel 21.5” or 27” (Mid 2015-2019))
BIOS Setting Value
Intel VT Enabled
Intel VT-d Enabled
X.M.P. Profile#1
Native ASPM Enabled
CFG Lock Disabled
Above 4G Decoding Enabled
Memory Remap Enabled
iGPU Multi-Monitor Enabled
DVMT Pre-Allocated 128M
ErP Ready Enabled (S4+S5)
Intel LAN Controller Enabled
Power On By PCI-e/PCI Enabled
Legacy USB Support Disabled
USB Keyboard and Mouse Simulator Disabled
Fast Boot Disabled
POST Delay Time 0 sec
Launch CSM Disabled
OS Type Other OS

Not Work


No Problem!

Update 2020-07-01: Disable Fast Boot in UEFI BIOS, or break your UEFI BIOS, but you can reset nvram to resolve it


Sidecar or DRM

If you add shikigva=80 to boot-args, Sidecar works but not perfect (frame blur), DRM OK.

Or do not do anything, use default config, Sidecar works perfect, but DRM doesn’t work.