Hey guys, hoping for help, I am using 530 GPU on this board and trying to get dual monitors to work under Sierra. I followed cnrd's guides for my initial el cap install and have dual monitors working under el cap using a variety of fixes and patches as recommended in this forum.
I had el cap running on two disks so once they reported the graphical glitches were fixed under sierra for the 530 I took the plunge and upgraded my second el cap to sierra following this guide. On a single monitor (either dvi or hdmi) sierra works fine.
On el cap, i have to boot with a single monitor and turn on the second one at the desktop, so that's fine.
On sierra, if I do that, both monitors go dark and never come back up.
I'm using smbios Mac Pro 6,1, the GFX0 to IGPU fix, inject intel yes, ig-platform-id 0x19120000, 4 port patch, several connector type patches, AGDPFix.app, and the Skylake Sierra 530 patches.
One suggestion is to change the smbios, i see people say iMac 14,2 (or 13,2?) is less trouble-prone. Any other ideas?
Thanks.