MatzeOS86 Posted January 29, 2012 Share Posted January 29, 2012 Hello everyone, ok, so first of all I would like to give you a overview of what the actual problem is and what I've done so far. So, the problem is that the second Northbridge is not detected by the system as soon as I use the custom DSDT attached at the end and therefore my second graphics card doesn't work. I've dumped the DSDT under Mac OS X using DSDT Editor and compared it with the one dumped under Windows. Both are identical. Then I've applied a few fixes/patches and everything works the way it should, except for my second graphics card, Here is the IOReg output with only the first card + EFI String: Mac Pro first EFI.zip As you can see, the Device BR50 is present including all the PCIBridges. IOReg output with only the first card + EFI String + DSDT: Mac Pro first EFI + DSDT.zip No more BR50 present. IOReg output with only the second card + GraphicsEnalber=Yes: Mac Pro second GE.zip The information get injected at the right position: PciRoot(0x50)/Pci(0x7,0x0)/Pci(0x0,0x0) IOReg output with only the second card + EFI String: Mac Pro second EFI.zip The information get injected at the wrong position: PciRoot(0x0)/Pci(0x7,0x0)/Pci(0x0,0x0) (that's the PCI Path of the first graphics card) DSDT: dsdt.zip I'm sure that the problem has something to do with the architecture of my Motherboard (two i5520 Chips), but I've no idea what I could do to get this fixed. Any suggestions are highly appreciated! Regards Link to comment Share on other sites More sharing options...
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