- Joined
- Sep 23, 2011
- Messages
- 22
- Motherboard
- Gigabyte GA-Z270X-UD3
- CPU
- i7-7700K
- Graphics
- RX 580
- Mac
- Mobile Phone
This problem was driving me nuts so I thought I would post my solution in case anyone else ran into it.
I was excited to see Sierra running perfectly on my 59060x / X99-Deluxe rig after so much trouble getting Yosemite to work. However, Sierra requires a new System Defintion (Mac Pro 3,1 no longer boots in Sierra.) The Haswell-E / X99 guides suggested Mac Pro 6,1 which did indeed work, however, I had to patch AppleGraphicsDisplayPolicy.kext to work around the monitor shutting off after the white Apple logo (something about the MacPro system definition shutting down your GPU on boot.)
The problem is that the patched AppleGraphicsDisplayPolicy.kext causes the GTX980 (I have two in SLI) to be recognized as "Nvidia Card 33 MB" by the web drivers, making the graphics painfully, unusable slow at 4K. The solution is to use an unpatched AppleGraphicsDisplayPolicy.kext and iMac14,2 System Defintiion. The fans ramp to 100% and the monitor blanks just after the white Apple logo, but the display switches back on, the fans calmn down and the web drivers run perfectly.
If you experience a long delay during boot, update to the latest FakeSMC.kext from the Resources section.
I was excited to see Sierra running perfectly on my 59060x / X99-Deluxe rig after so much trouble getting Yosemite to work. However, Sierra requires a new System Defintion (Mac Pro 3,1 no longer boots in Sierra.) The Haswell-E / X99 guides suggested Mac Pro 6,1 which did indeed work, however, I had to patch AppleGraphicsDisplayPolicy.kext to work around the monitor shutting off after the white Apple logo (something about the MacPro system definition shutting down your GPU on boot.)
The problem is that the patched AppleGraphicsDisplayPolicy.kext causes the GTX980 (I have two in SLI) to be recognized as "Nvidia Card 33 MB" by the web drivers, making the graphics painfully, unusable slow at 4K. The solution is to use an unpatched AppleGraphicsDisplayPolicy.kext and iMac14,2 System Defintiion. The fans ramp to 100% and the monitor blanks just after the white Apple logo, but the display switches back on, the fans calmn down and the web drivers run perfectly.
If you experience a long delay during boot, update to the latest FakeSMC.kext from the Resources section.