linux-kernel - Re: [BUG] [hwmon] linux 2.6.31-rc6 regression

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Message-Id: <1250432893.7591.5.camel@ayu>
Date:	Sun, 16 Aug 2009 10:28:13 -0400
From:	Calvin Walton <calvin.walton@...il.com>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Zeev Tarantov <zeev.tarantov@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] [hwmon] linux 2.6.31-rc6 regression

On Sun, 2009-08-16 at 07:37 +0200, Markus Trippelsdorf wrote:
> On Sun, Aug 16, 2009 at 02:03:03AM +0100, Matthew Garrett wrote:
> > On Sat, Aug 15, 2009 at 01:29:48PM +0300, Zeev Tarantov wrote:
> > 
> > > [    3.276720] w83627ehf: Found W83627DHG chip at 0x290
> > > [    3.276894] ACPI: I/O resource w83627ehf [0x295-0x296] conflicts
> > > with ACPI region HWRE [0x290-0x299]
> > > [    3.277171] ACPI: Device needs an ACPI driver
> > 
> > The hwmon driver is attempting to allocate a region that's also used by 
> > your ACPI firmware. There's no way to synchronise access between the 
> > kernel and the firmware, so allowing both is potentially racy - we've 
> > seen numerous cases where the combination results in the system 
> > incorrectly generating critical temperatuer shutdowns, for instance, 
> > when some other indexed access gets interpreted as the temperature or 
> > when the hwmon chip's state machine is confused. The failure of hwmon to 
> > bind is a feature here, not a bug. You can override it with 
> > acpi_enforce_resources=no on the kernel command line.
> 
> But we don't introduce »features« that break hardware monitoring on
> numerous machines in rc6 normally, IIRC.
> If this so important and critical to you, than just add a »hyperstrict«
> parameter to acpi_enforce_resources or make »lax« the default.

Note that, as this is an ASUS board, there is actually an ACPI firmware
driver available that will let you do hardware monitoring in a way that
doesn't conflict with the firmware - give the "ASUS ATK0110 ACPI hwmon"
driver a try.

-- 
Calvin Walton <calvin.walton@...il.com>

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