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[laulau <1201234@xxxxxxxxxxxxxxxxxx>]

I tried downgrading BIOS to all versions which supports AM3+ CPU's (3030, 3029, 3027) : same behaviour.
I unplugged one of the 2 video card : same behaviour.

then I realized that, on  the first screenshot, it seems to hang after ACPI.
So instead of testing with BIOS default settings, I turned off many options, and it worked !
then I switched on those options one by one, to find that it's C1E that has to be disabled.

replugging the 2nd card and flashing to le lastest BIOS works fine if I disable C1E.
C1E support is not very important as C6 works (CPU freq slow down when idle).

kernel loads correctly, X server doesnn't work properly on 13.04 and saucy daily. but it works fine on 12.04 !
but this is another bug.

** Summary changed:

- can't boot ubuntu  with crossfire
+ can't boot ubuntu  with C1E support enabled

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https://bugs.launchpad.net/bugs/1201234

Title:
  can't boot ubuntu  with C1E support enabled

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  hi ;
  sorry not following bug report procedure, but as the computer involved isn't able to boot, I must fidn a way to report.

  So the computer is hanging very quickly at the beggining of the boot
  (no kernel panic), then progressing a little when pressing a key, and
  then it is completly hanged (keyboard unresponsive, but no kernel
  panic).

  Here are the details :
  tried ubuntu 13.04, 12.04, live-cd, installed (before I bought my cards) ... same behaviour
  card are 2x radeon 7850
  motherboard is Asus M4A89GTD PRO/USB3
  CPU is AMD FX 8320

  I'll add 2 "screenshots" corresponding to the 2 hangs described.

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