Public bug reported:

When I am using a live-CD, the alternate-CD or the installed OS the System 
Freezes while booting.
When I am adding the bootoption acpi=off, the system starts normally.

I have tried to use the options noapic, noagp, noapm, pci=noacpi,
acpi=force. They did not work.

I think, the system is freezing while activating the acpi support

The last what was shown on screen is: ? child_rip
Then the system freezes. The NUM LOCK doesn't react and i need to press the 
power-button for 5 seconds to do a complete reset.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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Toshiba Satellite Pro C650D Freezes while bootprocess with ACPI on
https://bugs.launchpad.net/bugs/612341
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