- Joined
- Jun 26, 2012
- Messages
- 4,069
- Motherboard
- Asus Z170 Deluxe
- CPU
- i5-6600K
- Graphics
- GTX 970
- Mac
- Mobile Phone
Skylake Starter Guide
I've the exact same graphics card as you and I had a little trouble booting with dual monitors and the reason I found was a BIOS setting. I'm not sure how it is worded in the Gigabyte BIOS but in the ASUS Z170 Deluxe under Advanced/Boot:
CSM - Compatibility Support module
CSM Support = Enabled
Boot from PCI-E/PCI Devices = Default is Legacy First, I've set it to UEFI Driver First
This has allowed me to boot dual monitors, haven't tested a third but I'd assume it would be ok. Worth a shot at least. You'll still require the Display Policy patch otherwise you'll get no signal to either monitor.
Take a look above and give it a try.
17,1 works fine with a single monitor and the board-ix patch in Clover. I'm only using 1080p displays which makes it all the more confusing. Originally I thought it was the cabling (I posted in the Graphics forum about that) but after hooking up my monitors in a bunch of different ways I would always get the reset if they were both connected at boot.
(Combinations I tried: 2x DP -> HDMI passive, 2x DP -> HDMI active, HDMI + DP-HDMI passive, HDMI + DP-HDMI active, DVI + DP-HDMI active, DVI + HDMI)
My best guess is that there's something else going on in the AppleGraphicsControl kext aside from the EDID injection, since it happens at about the same time as the "regular" black screen would occur.
The only other relevant setting I can think of is that I have IGP disabled in the BIOS.
EDIT: I attached my config.plists for 14,1 and 17,1, maybe someone can see if there's secret sauce I'm missing.
I've the exact same graphics card as you and I had a little trouble booting with dual monitors and the reason I found was a BIOS setting. I'm not sure how it is worded in the Gigabyte BIOS but in the ASUS Z170 Deluxe under Advanced/Boot:
CSM - Compatibility Support module
CSM Support = Enabled
Boot from PCI-E/PCI Devices = Default is Legacy First, I've set it to UEFI Driver First
This has allowed me to boot dual monitors, haven't tested a third but I'd assume it would be ok. Worth a shot at least. You'll still require the Display Policy patch otherwise you'll get no signal to either monitor.
Ah I've had that exact problem!
There is a problem on my machine (not sure if others are affected), where using the idx patch stopped my secondary monitor from working and even invoked a reboot. Use the specific (config2 to none) patch in the AppleGraphicsControl plist file instead.
It does not work optimally, as I'm unable to change my wallpapers unless I turn off "Displays have separate spaces", which I suspect is caused by something else in the iMac 17,1 config (I haven't tested other smbios as I don't need that feature anyway).
Take a look above and give it a try.