I tried booting with some kernel options, here are the results. Kernel was 
3.2.0-14-generic #23 x86_64:
- nointremap: no freeze
- nox2apic: no freeze
- x2apic_phys: didn't boot properly, corrupted graphics and eventually froze on 
its own

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https://bugs.launchpad.net/bugs/922037

Title:
  "reduce brightness" key freezes system

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