FWIV, same problem here on a MacBookPro 8.2.
Dual video cards: integrated intel and external AMD 6490M.
Booting via refind (uefi mode).
I disable on boot the AMD card and set some parameters for i915via grub config, 
but still kernel 3.5.0-27 halts with blank screen. Last tested good version: 
3.5.0-26

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https://bugs.launchpad.net/bugs/1167114

Title:
  Ubuntu Kernel 3.5.0-27 does not boot

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