HD4400 has different requirements from HD4600...
Requirements:
- config.plist/Devices/FakeID/IntelGFX=0x04128086
- config.plist/Graphics/Inject/Intel=true
- config.plist/Graphics/ig-platform-id=0x0d220003 (or unspecified, as 0x0d220003 is default)
- IGPU memory set to 64mb in BIOS
- digital connection to monitor (DP, HDMI, DVI-D... VGA not supported)
- VT-d disabled (or use dart=0 kernel flag)
- correct ACPI configuration (you cannot drop the SSDT that has GFX0 configuration)
Extra credit:
- rename GFX0->IGPU for IGPU power management
Generally, Clover reads from EFI/Clover/config.plist. The EFI/Clover/OEM directory is for creating an EFI/Clover that works with multiple different systems. For advanced users only.
Renaming GFX0 to IGPU is done with ACPI patching. You can read the laptop guide for details:
https://www.tonymacx86.com/threads/guide-patching-laptop-dsdt-ssdts.152573/
The easiest way to accomplish the rename is via config.plist/ACPI/DSDT/Patches as described in the hotpatch guide.