The solution to this was to enable XMP but dial down the memory frequency to 2666 MHz as I have done below. I did this because I wanted to be able to enable XMP but this created a problem during boot up where the USB drives would get ejected when recovering from sleep-wake. settings if you don’t have the same memory frequency I have. I am going to repost the relevant section from the BIOS that corresponds to this. The solution was manually setting the RAM frequency down to 2666 MHz in the base config and then changing it up to 3200 MHz in the XMP and activating the XMP to Profile 1. Basically, it turns out that the fastest Apple computers today (Jan 2019) the iMac Pro has only 2666 MHz DDR4 RAM, so you cannot go over that number in your base config. I then found a great post on which had the solution in this post that I linked. However, I did not want to do this since I fully intended to overclock my system. I noticed that in the BIOS, if I turned off XMP (Extended Memory Profile) this problem went away. This was a much more interesting problem, and reportedly has to do with RAM management. USB drives constantly get ejected during sleep and when computer wakes up drives have been improperly ejected. I downgraded the BIOS to F11 and the system booted up immediately. Finally, it turned out I had upgraded my Gigabyte Motherboard BIOS to a version (F12c) that was causing this issue. I tweaked with a lot of memory drivers including deleting AptioMemoryFix.efi, adding OsxAptioFixDrv2, OsxAptioFixDrv3, EMUVariable64.efi etc, and nothing worked. This is one of the first errors I encountered that frustrated the heck out of me. System Hangs during First Boot, even before the first graphics screen was visible. When this didn’t happen, all I needed to do was to go into a Windows installation from Clover, play around a little bit, exit and reboot into MacOS and the problem was solved. I could not figure out until I found some information that it helps to boot into windows. On several occasions I ran into this weird bug where I would either remove a SSDT or DSDT patch and/or make a change and reboot the system, but the system would behave as if I didn’t make the change. Settings Changes were NOT taking effect after reboot. There is an excellent chance that someone else had the very same problem you did and may have found a solution. If you run into problems, post the questions on various hackintosh forums and ask someone. It is obvious that some of these problems are specific to my build and may not apply to you. Press F10 to boot.This section represents my log of issues that I ran into and how I fixed each one of them. Move the cursor to the line beginning linux and replace quiet splash with nomodeset. Access the GRUB menu after selecting Linux in Clover and press E to enter the GRUB editor.Reboot and you should see Linux in Clover. In the Scan section check the box for Linux.Select Mount EFI partition and, by trial and error, find the EFI partition and click the import button.Go to the Clover Configurator (you may need to install it).Inside Clover, you won't see any Linux partitions, so boot into MacOS to fix thatĬonfigure Clover to recognise Linux partitions Confirm write changes to disk, set up you user account, wait for the installation to finish, remove the USB key, and rebootĮnter the BIOS/UEFI settings and use trial and error to determine which of the boot options is Clover (the option may not have a helpful name).You can also disconnect your Windows and MacOS drives if you want to. An empty drive will have no partitions, but the installer will show partitions on Windows and MacOS drives. In the dialog, be very sure to select the correct drive. If you have multiple disk drives and want to install Ubuntu on an empty drive, select Erase the disk and install Ubuntu.Select the option to install 3rd party drivers.If you prefer, you can disconnect the drives Windows and MacOS are installed on to be totally sure you are not going to overwrite them. Here add the parameter nouveau.modeset=0 and press F10 to boot. Go to the line beginning linux and press N or move the cursor to go to the end of the line. If your system has an nvidia graphics card you may have problems, If so, move the cursor to Install Ubuntu and press E to enter the GRUB editor. When done, reboot with the USB key plugged in.
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