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@BreBro thanks for the hint! Updated my profile.

Hi, I upgraded my Hackintosh from 10.12.6 to 10.13.6 yesterday and migrated to APFS while at it. Since then, the apfs.efi driver's (taken from the 10.13.6 image) debug messages stay on the screen for 25 seconds, and then the Clover boot menu shows up. I did then apply a patch to hide those...

It would be in /Library/Extensions and/or (less likely) on your EFI partition (which you could mount with Clover Configurator).

+1. Try removing GPUSensors.kext - fixed it for me.

I had a similar issue and for me the culprit was FakeSMC_GPUSensors.kext. Try disabling it (e.g. by renaming it to FakeSMC_GPUSensors.kext$ and/or settings its permissions to 000) and see if your system boots properly then.

Thanks for the explanation! So if we could somehow prevent the UEFI from initializing the GPU (i.e. boot with a black screen till the Mac Bootloader takes over) or de-init the GPU again, we could work around this? Also, doesn't the Mac's EFI also init the GPU to display e.g. the disk selection...

If the annoying "boot to black screen" bug is on our side, is the reason for that known? Or is it just because the desktop RX 400 series is not 100% compatible with the drivers for the mobile variants?

Weird, my BaseSystem is only a bit more than a GB and my recovery partition 650 MB. Do you know why your recovery partition is so small (something might be amiss here)?

You can use a different compression algorithm (Bzip2 rather than deflate) to make the BaseSystem just small enough to fit. See e.g. http://superuser.com/questions/60274/further-compression-of-disk-image-file.

No matter what, they would be foolish not to consider NVIDIA as a GPU partner. At the moment, NVIDIA's GPUs are simply so much better than AMD's, especially in terms of power efficiency (which Apple cares a lot about).

I had a similar issue with 4k resolution. For me the problem (I think) was that the GPU's memory was so low that the 4k framebuffer didn't fit into it. As nunziantimo says, try increasing the amount of memory for the iGPU in the BIOS - that fixed it for me.

I tried the same. I think this is not possible with the Intel integrated graphics because their maximum framebuffer size is 4k (I guess), but only with dedicated GPUs (which hopefully would let you emulate 5120x2880 and then downscale that to your 4k monitor if that's what you mean).

I'm totally fine with that, but would that mean that I could just use the Intel IGP? Or would the Pascal GPU still be used, just in some kind of non-accelerated, 2D-only mode?

FYI, the GTX 780 might not work in the Mac Pro 1,1 (at least according to http://www.macvidcards.com/i-want-the-best-graphics-card-for-my-mac-pro-where-do-i-start.html).

That's too bad! I have been waiting with my Skylake build until this week so I could bridge the (as I hoped, short) waiting time till the 1070 comes out with the built-in Intel GPU. Would it be possible, though, to e.g. only use the 1070 on Windows and the Intel GPU on OS X instead? I would be...