linux-kernel - Re: linux-next: Tree for June 13: IO APIC breakage on HP nx6325

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Message-ID: <20080620122714.GA9332@srcf.ucam.org>
Date:	Fri, 20 Jun 2008 13:27:14 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Ingo Molnar <mingo@...e.hu>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: linux-next: Tree for June 13: IO APIC breakage on HP nx6325

On Fri, Jun 20, 2008 at 02:22:11PM +0200, Rafael J. Wysocki wrote:

> Ah, indeed, thanks for the hint.  This is the output of

Right. My recollection of this is somewhat hazy, so here's something I 
wrote a couple of years ago:

"If you dig through the DSDT code for the 6125, you'll find a bit where 
it writes 0x14 to 0xfec00000 and then checks whether offset 0x12 from 
there is 1. In other words, it's checking if pin 2 of the io-apic is 
masked. If it's not masked (that is, offset 0x12 is 0 and irq 2 is 
enabled) it sets another bit in a register. This is then checked by the 
thermal zone code which as a result sets the thermal trip temperatures 
to 16 degrees Celsius. This bites when the acpi_skip_timer_override 
option is used in Linux."

I have no idea what this code is for, but it's pretty clear that Windows 
sets it up in such a way that this isn't true.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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