Each patch has a comment. I clearly identified the patch by its comment in post #4742.
Post #4734 shows you're using the wrong config.plist for your hardware.
And the ioreg shows your internal display is not working.
You're using 0x01660003 where 0x01660004 is required for the internal 1600x900 display.
Also in #4741, you're using the wrong ACPI setup. You need SSDT-IGPU-HIRES.aml for 1600x900. Use the correct parameter to install_acpi.sh.
Also, your profile is wrong. It indicates only Radeon graphics, where clearly you also have HD4000. Please fix.
I'm surprised you didn't mention your internal display not working... I didn't even look initially at the ig-platform-id in use, as you mentioned only issues with external display.
You should follow the guide correctly and as written.
Note:
Code:
SPEEDY-NUC:probook.git rehabman$ ./install_acpi.sh help|grep 8x70
install_8x70
install_8x70_hires
Your 1600x900 internal display corresponds to install_8x70_hires.
What kind of external display are you plugging in?