Boot hang: Sony VAIO

[Konstantin Belousov]

On Wed, Jun 17, 2015 at 03:09:16PM -0230, Jonathan Anderson wrote:
> > On Jun 17, 2015, at 2:39 PM, Konstantin Belousov <kostikbel at gmail.com> wrote:
> > 
> > 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.
> 
> That seems to fix it... thanks!
> 
> Is there a Wiki page somewhere for people to document these kinds of workarounds for particular configurations?
> 

The issue with x2APIC and _some_ Sandy Bridge laptop is known for long time,
but I am unable to find and reliable commons in the set of machines which
have trouble.  I might end up disabling x2APIC on mobile Sandys at all.