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SubjectRe: [BUG] [hwmon] linux 2.6.31-rc6 regression
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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@gmail.com>

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