Radeon Compatibility Guide - ATI/AMD Graphics Cards

[Deleted member 188658]

Have you tried disabling IGPU in bios? I noticed KBL in the pic you posted.

I have tried disabling the IGPU and tried enabling the IGPU. No change in behavior in either case.


And finally found the thread that has a great description of managing file system issues from Clover shell:

[SOLVED] Clover Update r4586 disables OS Boot (Black Screen)

 

[Deleted member 188658]

I'm still dead in the water.

I can't get my USB HS Installer to boot to the Repair screen. Any Apple boot just ends up with a stop, as I posted in #2588 above.

I have tried booting with the IGPU, same result. I can take the USB installer to my GA-Z97X hack and boot it fine .

I can run Windows 10 on this Hack, Z270 and there are no problems.

Surely attempting to boot to the USB installer ignores every kext and kernel and cache on my HS OSX SSD ?

Is this thread dead? Am I writing to /dev/null ?

In summary I'm trying to get this Z270 hack to boot with a brand new Sapphire Pulse RX580. I just can't.

 

[Gigamaxx]

Why don’t you try taking the card out and do a fresh install using the IGPU? After that is set up and running put the card back in. Eliminate the card as a factor and see if it is something else in the configuration.

 

[Deleted member 188658]

Why don’t you try taking the card out and do a fresh install using the IGPU? After that is set up and running put the card back in. Eliminate the card as a factor and see if it is something else in the configuration.

I have a SilverStone SST-RVZ03B case for my ASUS ITX Z270, and it is an incredible pain to assemble and disassemble. It's a tiny box into which I have stuffed a single fan water cooler, a 3/4 sized power supply and 3 SSDs. The cooling fan is mounted on the outside.

I started this with a ITX Radeon RX570 which didn't work - see prior postings from earlier in the month. I retracted that and put BACK the NVidia GTX 950 and rebooted with no problems. So I then bought this RX580 as it was deemed 100% compatible all over this Forum. Unpacked the case, stuffed in the RX580 and booted to this nightmare. As I've said a million times this works fine on the Windows 10 boot.

Now I've re-enabled the IGPU in the BIOS and am running the Windows on it. But it doesn't change the failure to boot to any OSX.

Before I rip this pain apart again, I would like to know why I can't boot to the USB High Sierra install stick. What is happening there?

I think now this is an ACPI problem of some nature. Someone out there must have a suggestion - before I tear it apart.

Is there a BIOS setting that I'm missing - is this the common point? Any yes I have followed all advice I can find on BIOS defaults. And I have varied all I can find in the BIOS with regard to Graphics option - the latest being booting on the IGPU.

I'm now thinking of replacing the computer case to something bigger uglier but easier to jig.

My weekend homework will be to build a new USB Install stick from scratch, test it on my GA-Z97X hack and see if I can boot it on this Z270X hack.

I'm fishing for ONE more suggestion before I follow your advice, which believe me, I had already considered.

WTF?

 

[oldweb]

I'm still dead in the water.

I can't get my USB HS Installer to boot to the Repair screen. Any Apple boot just ends up with a stop, as I posted in #2588 above.

I have tried booting with the IGPU, same result. I can take the USB installer to my GA-Z97X hack and boot it fine .

I can run Windows 10 on this Hack, Z270 and there are no problems.

Surely attempting to boot to the USB installer ignores every kext and kernel and cache on my HS OSX SSD ?

Is this thread dead? Am I writing to /dev/null ?

In summary I'm trying to get this Z270 hack to boot with a brand new Sapphire Pulse RX580. I just can't.

hello, in bios set IGPU at 32 Mb? in my case another value is black screen!!

 

[Gigamaxx]

You can also just unplug the RX 6-8 pin power cords.

 

[khriswithak]

I have a SilverStone SST-RVZ03B case for my ASUS ITX Z270, and it is an incredible pain to assemble and disassemble. It's a tiny box into which I have stuffed a single fan water cooler, a 3/4 sized power supply and 3 SSDs. The cooling fan is mounted on the outside.

I started this with a ITX Radeon RX570 which didn't work - see prior postings from earlier in the month. I retracted that and put BACK the NVidia GTX 950 and rebooted with no problems. So I then bought this RX580 as it was deemed 100% compatible all over this Forum. Unpacked the case, stuffed in the RX580 and booted to this nightmare. As I've said a million times this works fine on the Windows 10 boot.

Now I've re-enabled the IGPU in the BIOS and am running the Windows on it. But it doesn't change the failure to boot to any OSX.

Before I rip this pain apart again, I would like to know why I can't boot to the USB High Sierra install stick. What is happening there?

I think now this is an ACPI problem of some nature. Someone out there must have a suggestion - before I tear it apart.

Is there a BIOS setting that I'm missing - is this the common point? Any yes I have followed all advice I can find on BIOS defaults. And I have varied all I can find in the BIOS with regard to Graphics option - the latest being booting on the IGPU.

I'm now thinking of replacing the computer case to something bigger uglier but easier to jig.

My weekend homework will be to build a new USB Install stick from scratch, test it on my GA-Z97X hack and see if I can boot it on this Z270X hack.

I'm fishing for ONE more suggestion before I follow your advice, which believe me, I had already considered.

WTF?

Do you have the USB injection fix (high sierra version) installed on the USB stick drive itself? I had a problem similar to this where I couldn't get to the installer because my build couldn't recognize the USB Drive properly under MacOS because the USB ports weren't properly configured. I know they recommend the fix when installing MultiBeast but for some builds its also important to install it on the USB Stick itself too. This is the only thing I could think of that it might be.

 

[Deleted member 188658]

You can also just unplug the RX 6-8 pin power cords.

Good idea; but if you saw this box you would know there's no way in hell I can but them back in without taking the whole thing apart again.

hello, in bios set IGPU at 32 Mb? in my case another value is black screen!!

I'll give it a try.

Do you have the USB injection fix (high sierra version) installed on the USB stick drive itself? I had a problem similar to this where I couldn't get to the installer because my build couldn't recognize the USB Drive properly under MacOS because the USB ports weren't properly configured. I know they recommend the fix when installing MultiBeast but for some builds its also important to install it on the USB Stick itself too. This is the only thing I could think of that it might be.

Ok. I will put the SSDT-UIAC.aml on the USB stick for the Z270X motherboard and give that a try. I assume that's what you're suggesting?

However remember if I put BACK the NVidia card it works, and USB works. So the existing Clover that attempts to boot the Z270X has this fix/support built in.

Thanks for the suggestions. Work to be done this evening....

 

[Deleted member 188658]

Sad to report nothing works.

However I have a clue.

With the Sapphire Pulse RX580 in the system my BIOS splash screen shows this:

ASROCK | Sapphire

in blue. It used to have a simpler ASROCK splash screen. A google search found this:

https://forum.level1techs.com/t/asrock-sapphire-boost-question-solved/118053

There appears to be some kind of "Symbiotic" relationship between the Sapphire Video card and the ASROCK Z270 Gaming-ITX/ac Motherboard. Some kind of POWER or Clocking OVERRIDE.

How can I disable / remove this feature???

I think this is the key, as the halt appears during ACPI or PCIe config and the combo of this MB and Video card is preventing boot.

 

[Deleted member 188658]

However I have a clue.

Wow! Major breakthrough. (Yes I know you're all holding your breath...)

I checked the ASROCK BIOS download and found that my version 2.30 was not the latest, so I downloaded the latest version 2.50 and flashed it. The initial reset of the BIOS caused by the re-flash gave me some heart attacks, - thinking I had a dead motherboard - but the flash had caused the boot port to switch to the Sapphire RX580 and turn off the IGPU port which I had been connected.

Once over that hurdle, I booted to Windows 10. No problems.

I restarted on my installed SSD Clover 4578 version, with my original config.plist and BLACK SCREEN - what a JOY! No more hangs on boot. Nothing to do with FakePCIID or any of the other suspicions. Never thought that a black screen could be so pleasing.

I was successfully able to boot to SINGLE USER MODE!

Once there, I moved

FakeSMC.kext to FakeSMC.kext.bak
FakePCIID.kext to FakePCIID.kext.bak
FakeIntelGraphics.kext to FakeIntelGraphics.kext

then /usr/sbin/kextcache -i /

watched it rebuild, seemed to be successful.

Rebooted. BACK SCREEN.

BUT. I'm back in the world of black screens, WITH Lilu.kext and WhateverGreen.kext in /Library/Extensions.

This is a familiar place for this Forum. I'm now asking for possible solutions to the black screen boot. Black screen results in boot to Safe Mode, and to Recovery mode, and for USB installer stick. Nothing gets past the black screen. Oh I have tried with RadenDebugInit true and false. Same result -> black screen. iMac type is back to iMac 18,2.