captjimmie

tallest skil said:

For the love of… I have to clean install 10.10 or earlier now. I didn’t turn off SIP before applying the firmware upgrade, so now it will always refuse to apply it until an OS without SIP is in play. I think I’ll just deal with not being able to sleep OS X for a while. After all, I can’t sleep Windows, either.

Some SEO references for anyone who had to dig through a dozen websites like me:

MacPro4,1
MacPro5,1
Black screen on sleep; hard restart
GTX 980 970 960, pci10de,fbb
Mac Pro firmware update utility

And now what I figure is the proper series of steps so that people don’t get stuck like me:

Disable SIP on your Mac Pro
Download the Mac Pro firmware update utility
Download Mac Pro EFI update 1.5
Mount the Mac Pro EFI update 1.5
Run the Mac Pro firmware tool
Do what it says
You should see a change in System Information from this to this.
Enable SIP on your Mac Pro

And supposedly things will work, but again, I’m not there yet myself.