Slice is correct. These drivers are helping to run new El Capitan features. It's not possible to just "pull the tablecloth away". Since these GPUs work on real Macs, I think we have a real chance at fixing this problem and consequently making our Hackintoshes emulate Mac hardware even better.
I wish I had the time to do some research and help you guys out, but my hands are kind of tied, like most people here. So I wish Slice, Mieze & Co the best luck at fixing this problem. I'd also love to have sleep back again, but we have to wait for a real solution.