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

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Date:	Sun, 15 Apr 2007 14:31:41 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Pavel Machek <pavel@....cz>, Chuck Ebbert <cebbert@...hat.com>,
	Rudolf Marek <r.marek@...embler.cz>,
	linux-acpi@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	lm-sensors@...sensors.org
Subject: Re: [lm-sensors] Could the k8temp driver be interfering with ACPI?

On Sunday 15 April 2007 03:41, Jean Delvare wrote:
> On Fri, 13 Apr 2007 14:59:45 -0600, Bjorn Helgaas wrote:
> > Of course, there are always BIOS defects.  But if we could make a
> > case that a BIOS that doesn't declare the resources used by the AML
> > is defective, we could add quirks to reserve the undeclared resources.
> 
> Only realistic if the list of systems needing a quirk is small. Do you
> think that would be the case?

I don't know.  I confess that I don't clearly understand the problem
yet.  It sounds like the sensor drivers want to talk to hardware that
ACPI methods might also use.

But I missed the details, such as the specific devices in question,
which ports they use, how they are described in ACPI, which AML
methods use those ports, and which non-ACPI drivers also use them.

It also sounds like the non-ACPI drivers provide much more
functionality than ACPI exposes.  I'd like to understand this,
too, because an  obvious way to solve the problem would be to
drop the non-ACPI drivers.  Is this extra functionality available
on Windows?  If so, do we know whether Windows uses non-ACPI drivers
or whether they have some smarter way to use ACPI?  In the long
run, I think the easiest, most reliable route would be to use the
system in a similar way.  Then we'd be doing things the way the
manufacturer intended and we'd take advantage of all the Windows-
focused firmware testing.

Bjorn
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