That flag has to be set also at the Ubuntu Kernels which is as of 2021 unclear. This is nothing less then a (rudimental) mixed-mode 64bit CPU & OS support on 32bit EFI!īut to be clear, this is only the first part in the puzzle. However, the whole situation has changed in 2021 somewhat because there exist since Linux kernel 5.7 a new feature called LOAD_X64_ON_IA32_ENABLE. 3GB avaiable), super-slow UDMA133 speed at the SATA300 ports, and others stuff. Unfortunately this gives several disadvantages like lesser RAM memory (only max. Only an installation through the legacy CSM Bios emulation layer is possible. This is the effective problem in that matter because it prevents almost fully the installation of a 64bit Linux version in native EFI mode on those 2006 iMac models. To make it even more complex, there exist at the Apple iMac5,1, iMac5,2 and iMac6,1 models also a mismatch between the EFI version, which is 32bit and the CPU which is 64bit. Under native EFI, the vBIOS is avaiable just for a very short time at power-on. On these Apple models, the vBIOS is usually only continuously exposed when the legacy CSM Bios emulation mode (aka Boot Camp) is active. The first big problem is that on these early Apple Intel computers the vBIOS is not really exposed in native EFI Mode. ) At the beginning it should be noted that this topic here is one of the most complex regarding the installation of K(U)buntu in native EFI mode. Here are the prints when left to boot normally: Apr 17 14:11:18 macbuntu kernel: radeon kernel modesetting enabled.Īpr 17 14:11:18 macbuntu kernel: radeon 0000:01:00.0: remove_conflicting_pci_framebuffers: bar 0: 0x40000000 -> 0x47ffffffĪpr 17 14:11:18 macbuntu kernel: radeon 0000:01:00.0: remove_conflicting_pci_framebuffers: bar 2: 0x48400000 -> 0x4840ffffĪpr 17 14:11:18 macbuntu kernel: radeon 0000:01:00.0: vgaarb: deactivate vga consoleĪpr 17 14:11:18 macbuntu kernel: initializing kernel modesetting (RV530 0x1002:0x71C5 0x106B:0x0080 0x00).Īpr 17 14:11:18 macbuntu kernel: radeon 0000:01:00.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xa3a3Īpr 17 14:11:18 macbuntu kernel: radeon 0000:01:00.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0x2323Īpr 17 14:11:18 macbuntu kernel: ] *ERROR* Unable to locate a BIOS ROMĪpr 17 14:11:18 macbuntu kernel: radeon 0000:01:00.0: Fatal error during GPU initĪpr 17 14:11:18 macbuntu kernel: radeon: finishing device.Īpr 17 14:11:18 macbuntu kernel: Memory type 2 has not been initializedĪpr 17 14:11:18 macbuntu kernel: radeon: cp finalized
Nomodeset is being obeyed, but still no graphics, not even console prints: Apr 17 13:38:37 macbuntu kernel: VGACON disable radeon kernel modesetting.Īpr 17 13:38:37 macbuntu kernel: ] *ERROR* No UMS support in radeon module!
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It also is rejecting SSH connections so I am really stuck on how to get more information from the box as to what is going wrong.ĮDIT: By blindly typing after Ctrl+Alt+F1 I have successfully got SSH installed so I can meddle with the box now.įYI: /var/log$ lspci -k | grep -EA2 'VGA|3D'Ġ1:00.0 VGA compatible controller: Advanced Micro Devices, Inc. Also, the HDD is all a flurry so boot is occurring, just no display.
I have tried entering "echo" lines in grub after the images are loaded and can see those prints. Recovery mode options in GRUB also produce no graphics. I have removed "quiet" and inserted "nomodeset" and still no graphics are visible. Now after installation, there are no graphics visible. I had to insert "nomodeset" in the installer to get graphics and complete installation. I have after pulling teeth and hair installed Xubuntu 18.04 LTS on 2006 iMac 5,1 (ATI X1600 graphics).