linux-kernel - Re: Some sort corruption of my Thermal Subsystem after suspend to ram

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Date:	Thu, 1 May 2008 18:09:46 +0200
From:	Pavel Machek <pavel@....cz>
To:	Len Brown <lenb@...nel.org>
Cc:	Gabriel C <nix.or.die@...glemail.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-pm@...ts.linux-foundation.org,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: Some sort corruption of my Thermal Subsystem after suspend to
	ram

Hi!

> The ICH9 apparently provides a pair of memory mapped on-die thermal sensors.
> 
> The sensors basically shut off your hardware if it gets too hot.

Are the sensors driven by ACPI? Probably yes, otherwise they would be
unable to shut down the system.

> ICH9 exports the base address for the sensors via a PCI device -- D31:F6, aka Linux 00:1f.6
> 
> I'm not aware of a native Linux device driver that talks to this device
> (nor can I think of a useful purpose for such a driver)
> So it seems what is in play here is any BIOS code that talks to this device,
> and Linux's standard PCI config space restore.
> 
> My guess is that the BIOS is enabling the device on cold boot,
> but not enabling it after resume from S3.

That sounds like a BIOS problem, right? If the piece of hardware is
driven by BIOS, Linux can't be responsible for saving/restoring it.
 									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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