On Wed, Jun 17, 2015 at 02:32:16PM -0230, Jonathan Anderson wrote:
> The system boots the 11-CURRENT kernel in "safe mode" (not sure if it???s the 
> kern.mp.disabled or kern.eventtimer.periodic that???s causing that), after 
> which `dmesg -a` produces the following output:
> 
> https://people.freebsd.org/~jonathan/vaio-acpi-dmar.txt

Try a loader tunable hw.x2apic_enable=0.
Your UP boot was successfull with x2APIC mode enabled and set, but there
are rumors that some SandyBridge BIOSes are buggy.
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