- Joined
- Feb 21, 2017
- Messages
- 194
- Motherboard
- HP Envy 17-U275CL
- CPU
- i7-8550U
- Graphics
- GTX MX150 / HD 620, 1920x1080
- Mac
- Mobile Phone
I had no trouble with dual display on Sierra except if I booted with 2 displays connected. For High Sierra I had to do the VNC for both one display and 2 display, then once that was done I could only boot with a single display connected & then connect in the 2nd and they would work fine
I had an Asus z270 board that was like that. It would not boot Sierra with both monitors connected to the Nvidia card. Plug in after it was fine. I got a new motherboard (for a different reason) same chipset, same audio, I didn't touch my EFI and all of a sudden I could boot Sierra with both displays connected.
I suspect a DSDT edit is required to fix that.
On Sierra if you try to boot with both displays connected, and everything goes dark, is your hack even ping-able? With my old board it was not.