linux-kernel - Re: [lm-sensors] Could the k8temp driver be interfering with ACPI?

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Date:	Tue, 20 Feb 2007 10:08:26 -0500
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Rudolf Marek <r.marek@...embler.cz>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org, lm-sensors@...sensors.org
Subject: Re: [lm-sensors] Could the k8temp driver be interfering with ACPI?

Rudolf Marek wrote:
> Hello all,
> 
> I got the DSDT from chuck and it seems there is nothing interesting - no
> declaration of PCI_config for the registers. If someone wants to check it I can
> send him the DSDT.
> 
> _TMP looks like this:
> 
>  Store (\_SB.PCI0.LPC0.EC0.RTMP, Local0)
>                     Store ("Current temp is: ", Debug)
> 
>                     Store (Local0, Debug)
> 
>                     Store (Local0, \_SB.CM25)
> 
>                     Return (Add (0x0AAC, Multiply (Local0, 0x0A)))
> 
> This looks quite OK LPC0.EC0 is embedded controller IO RAM at 0x62. Nothing
> special. I guess some SMM interrupt is reading the the PCI regs and sends it to EC.

I blacklisted the k8temp driver (and the out-of-tree k8_edac driver
in Fedora) and the temps were still volatile, so that's not causing
it. Since then I've upgraded the system BIOS from F.06 to F.27 and
the problems _may_ have gone away. My own custom 2.6.19 kernel has
never been a problem, so I'm thinking it's one of these drivers
loaded by Fedora that I never even compile:

	i2c_core
	i2c_ec
	i2c_piix4
	asus_acpi (on a Compaq???)
	sbs


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