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[Michael Nagel <ubuntu@xxxxxxxxxxxxxxxxx>]

just had this problem when installing 12.04.2 LTS on a macbook pro 5.5
i could use the default image, but at the grub boot parameters i had to add "nomodeset" and remove the "gfxmode $linux_gfx_mode". for debugging purposes i removed "quiet" and "splash" earlier to see where it hangs...

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https://bugs.launchpad.net/bugs/911689

Title:
  [precise] [oneiric-alpha1] bootup hangs after ~ 4 secs due to
  nouveaufb  - EFI VGA conflict

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  I am trying to install ubuntu on Intel SandyBridge, Asus P9X79 Deluxe
  board and nVidia Gainward GTX 560 Ti Phantom graphics card. When I
  boot the live USB (both oneiric and precise), deleting the "splash"
  and "quiet" options from GRUB, I get this error after about 4 seconds,
  after which the compter freezes:

     [drm] nouveau 000:02:00.0: Detected an NVc0 generation card (0x0ce00a1)
     fb: conflicting fb hw usage nouveaufb vs EFI VGA - removing generic driver

  I have not found any way how to prevent nouveaufb from kicking in,
  e.g. via blacklist=nouveaufb or similar.

  This problem is not mentioned in release notes for oneiric or precise
  either.

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