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Date:      Wed, 17 Jun 2015 20:09:16 +0300
From:      Konstantin Belousov <kostikbel@gmail.com>
To:        Jonathan Anderson <jonathan@FreeBSD.org>
Cc:        freebsd-current@freebsd.org
Subject:   Re: Boot hang: Sony VAIO
Message-ID:  <20150617170916.GC2080@kib.kiev.ua>
In-Reply-To: <176EBAFD-0EEF-4D6B-9136-0006C994FDFF@FreeBSD.org>
References:  <F37E1325-76ED-4533-9146-26E14F63FC12@FreeBSD.org> <20150617143049.GZ2080@kib.kiev.ua> <633BF6AA-D201-4647-8F14-401911DABCBE@FreeBSD.org> <20150617165456.GB2080@kib.kiev.ua> <176EBAFD-0EEF-4D6B-9136-0006C994FDFF@FreeBSD.org>

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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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