What version of acpi is supported?

[Nate Lawson]

Steve Kargl wrote:
> On Tue, Jul 15, 2008 at 03:30:04PM -0700, Nate Lawson wrote:
>> Steve Kargl wrote:
>>> I have several ASUS KFSN4-DRE motherboards.  The BIOS
>>> allows one to select acpi version 1, 2, or 3 where 3
>>> is the defaults.  Under heavy load and acpi v3, these
>>> motherboards shut themselves off.  The boards appear
>>> to be stable if I select v1.  So what, version of 
>>> acpi does FreeBSD support?
>>>
>> Most of 1, a lot of 2, a little of 3.
> 
> So does v2 or 3 must have a (low?) thermal protection
> mechanism that shuts down a system?  And, can the
> threshold be tweaked?

It doesn't work that way.  When you specify a version to the BIOS, it 
changes the AML (byte code) that it exports to the OS.  Depending on 
what we do (or don't do) with it, the BIOS is deciding at some point it 
doesn't like the OS behavior and shuts down.  It could be anything. 
You'd have to look at the AML to figure out what we're poking or not 
poking that the BIOS isn't happy with.

Are you loading cpufreq?

-- 
Nate