;) I have no idea about that. This HDMI indeed output 4k@30hz in Windows. But MacOS can receive 4k@60hz. It is very strange. Maybe this hdmi is a FAKE 1.4 ? I'm sure that uhd 630 can support 4k@60 on hdmi2.0. Maybe this hdmi is 2.0, but the mainboard has done something that restrict the signal...
Your config only output 2k@60hz signal. I increase the value of Framebuffer-fbmem and framebuffer-stolenmem, and add framebuffer-unifiedmem. All of these are set the ram of graphics to support 4k monitor. 1532mb and 2048mb is nothing different in normal use I think.
hi rehabman, I had copied SSDT-PNLF.aml in ACPI/patched, and AppleBacklightFixup.kext installed to /L/E.
Brightness Slidebar showed, but it has no effect when sliding that bar.
the macOS version is 10.12.6