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

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Message-ID: <46B5B45E.3030208@s5r6.in-berlin.de>
Date:	Sun, 05 Aug 2007 13:28:30 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	lm-sensors@...sensors.org
CC:	linux-kernel@...r.kernel.org,
	"Mark M. Hoffman" <mhoffman@...htlink.com>,
	Jean Delvare <khali@...ux-fr.org>
Subject: Re: 2.6.23-rc1 regression: hwmon/w83627ehf: wrong fan speed

I wrote:
> Now that I booted from 2.6.22-rc5 to 2.6.23-rc2 I noticed that ksensors
> displayed 1/16 of the actual speed of the CPU fan (correct is ca. 1400
> RPM under light load) and 0 for the case fan (correct is ca. 480 RPM
> under light load).
> 
> I reverted patch
> 	hwmon/w83627ehf: No need to initialize fan_min
> and the behaviour changed as follows:  ksensors displays the correct CPU
> fan speed when loaded for the first time after the w83627ehf was loaded,
> then drops to 1/16th the next time it refreshes the display.  (I
> configured 30s update interval in ksensors.)  But the case fan's speed
> is now correctly displayed all the time.  Ksensors' fan speed
> multipliers are configured as 1.
...
> Booting back into 2.6.22-rc5 (which seems identical with 2.6.22 as far
> as w83627ehf is concerned) brings back the correct fan speeds.

PS:  The actual behavior under 2.6.22-rc5 is that the CPU fan speed is
displayed correctly from the start, while the case fan speed is
initially shown as 0 but jumps to the correct speed after ksensors'
first display update.
-- 
Stefan Richter
-=====-=-=== =--- --=-=
http://arcgraph.de/sr/
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