linux-kernel - Re: [lm-sensors] it87 sensors need an ACPI driver (2.6.31)

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Date:	Tue, 06 Oct 2009 19:22:15 +0400
From:	Michael Tokarev <mjt@....msk.ru>
To:	Luca Tettamanti <kronos.it@...il.com>
CC:	Brad Campbell <brad@...p.net.au>, lm-sensors@...sensors.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [lm-sensors] it87 sensors need an ACPI driver (2.6.31)

Luca Tettamanti wrote:
> On Mon, Oct 5, 2009 at 6:42 PM, Michael Tokarev <mjt@....msk.ru> wrote:
[]
>> Well, I just tried it here and it works here too, on 3 different
>> asus motherboards.  But asus_atk0110 is far less useful than the
>> it87 variant.  Yes atk0110 shows correct labels for various sensors,
>> but for one there's no way to control fan speeds using it, at least
>> not currently, -- something which is done by it87 easily.
[]
> The main reason for using atk0110 is correctness: the resources are
> claimed by ACPI, it might not be safe to touch them (for the same
> reason two drivers are not allowed to map e.g. the same PCI BAR).
> On newer boards the risk of collision is pretty high, since the hwmon
> chip is used by an EC that works in background... on other boards the
> risk is much lower since the hwmon chip doesn't seem to be probed
> actively.
> Anyway, as user you can override this decision with
> "acpi_enforce_resources=lax", but _I_ wouldn't recommend it.

If there's a choice between "does not work but correct" and
"incorrect but works", i'd prefer the latter, and I'd say any
sane person agrees.

I spent quite some time choosing a motherboard that is able
to control fan speeds.  Now if know that it does that "incorrectly".
So I should either throw it away because one of the most
important criterias (ability to control noise level) does
not satisfy me anymore, or use it the "wrong" way as I did
for whole last year.  Ditto for 4 other asus motherboards
that have exactly the same problem.

Yes I know about acpi_enforce_resources.

Ok.  Now a pure technical question, finally.  Is there a
way to made asus_atk0110 to be able to *set* fan speeds
too, in a way as it's done by it87?

Because that's mostly the only issue with this driver,
and for me at least it's a show-stopper.

Thanks!

/mjt
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