linux-kernel - Re: 2.6.23-rc1 regression: hwmon/w83627ehf: wrong fan speed

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Message-ID: <20070812112153.59454e84@hyperion.delvare>
Date:	Sun, 12 Aug 2007 11:21:53 +0200
From:	Jean Delvare <khali@...ux-fr.org>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	"Mark M. Hoffman" <mhoffman@...htlink.com>,
	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org
Subject: Re: 2.6.23-rc1 regression: hwmon/w83627ehf: wrong fan speed

On Sat, 11 Aug 2007 17:48:41 +0200, Stefan Richter wrote:
> Jean Delvare wrote:
>> So my theory is that something else (BIOS, ACPI?)
> 
> (ksensors?)

ACPI if my guess is correct.

>> is changing the bank,
>> probably to read temperature values which are in banks 1 and 2, causing
>> the w83627ehf to get a wrong value for the VBAT register. If I am
>> right, then the attached patch should help. Please give it a try and
>> report.
>
> This patch fixes the issue.  (I didn't reboot, only reloaded the drivers
> after patching.)
> 
> Thanks for your help and advice.

Great, thanks for testing and reporting. Mark, please add my patch to
your hwmon-testing queue, and send it to Linus in the next batch of
fixes.

If no problem is reported, we can get rid of w83627ehf_reset_bank() in
a later kernel version.

-- 
Jean Delvare
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