I was now actually able to solve this myself and totally by chance.
Recently upgraded to a Vega 56 and in order to get it running, I had to change my SMBIOS (more info here). Well, guess what, shutdown and reboot are working again!
Big surprise, I actually got it running now! Changing the SMBIOS to iMac 18,2 did the trick! It's now running on HDMI at least. DisplayPort doesn't appear to work, but I will look into that this evening. EDIT: After some googling, DisplayPort is now working too! Plus, shutdown and reboot seems...
Yup, got the adapter yesterday, still no luck.
Cheers for the tips! So, what I've tried so far is changing the SMBIOS to MacPro5,5 directly through clover, as that's the only one of the mentioned models that Clover supports configuring out of the box, but it won't boot since the MacPro5,5...
Ah, good call. But it appears I can't change the refresh rate through the monitor's settings. On DP I get a 3440x1440 60hz signal according to the settings panel and on HDMI a 3440x1440 signal, which is both to be expected, just not as a black screen.
What resolution could that be? I have a 3440x1440 monitor and I doubt there could be something it doesn't support? The Apple boot is in the correct resolution btw.
Maybe I can somehow enforce a resolution through clover?
Yes, that was my impression too.
If I remember correctly, I had screen sharing disabled and ssh gives me a connection refused. However, the machine does show up in my network and I'm able to ping it, so I assume it's running fine - just no image.
Dear community,
A couple of days ago, I made the switch from my old GTX 770 to the Sapphire Vega 56 Nitro+ GPU. Rather foolishly, I assumed it would work out of the box and therefore didn't do any research on potentially required kexts etc. Well, turns out, it doesn't work out of the box and...
Nope, that one didn't do it for me, and of course unusable, as you said. But could it be a graphics issue? I see you're running a 7-series card too ...
No, sorry mate. I'm afraid I haven't ...
However, the USB 3 issue came up with my machine too, and reinstalling the corresponding drivers via MultiBeast helped in my case.
EDIT:
Just saw brebo's reply. Obviously, what he said.
Yup, found that too. Had a look at my BIOS version and discovered I wasn't running the latest one (although I was super certain I actually was), went ahead and updated (to v3.4) - still no luck though.
Attached are my ACPI settings.
Many thanks!
Thanks for the detailed explanation! However, I applied everything you mentioned (except for the Power Management part, wasn't able to find said setting) but still no luck ...
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