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  • IMO KMS should take care of the nomodeset settings. Have you tried radeon.modeset=0 or whatever driver you use? Commented Apr 5, 2014 at 1:31
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    @Braiam like I said, that makes the machine boot, but it disables a required component of the ATI driver. wiki.archlinux.org/index.php/ATI#Kernel_mode-setting_.28KMS.29 Commented Apr 5, 2014 at 1:41
  • Have you confirmed it actually hangs, and not just is breaks video out? E.g., can you ssh in? If not, does it at least ping? If so, you need a netconsole... Commented Apr 5, 2014 at 2:55
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    The clover bootloader people handle this kind of stuff all of the time for the hackintosh crowd. Maybe it's applicable vice-versa: clover-wiki.zetam.org/Configuration/SMBIOS Commented Apr 7, 2014 at 5:32
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    For what it's worth, from having tried myself, I do not believe it is possible to get proprietary nvidia/fglrx drivers running if you boot the kernel in EFI mode (as one would for a MBP). Commented Apr 15, 2014 at 17:52