Date: Mon, 14 May 2007 20:08:19 +0200
From: Jean Delvare <khali@linux-fr.org>
To: "Antonino Ingargiola" <tritemio@gmail.com>
Cc: "Linus Torvalds" <torvalds@linux-foundation.org>,
       "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>
Subject: Re: Linux 2.6.22-rc1
Message-ID: <20070514200819.12fdb184@hyperion.delvare>
In-Reply-To: <5486cca80705140904p307138bdx511bf2f186a07221@mail.gmail.com>
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Hi Antonino,

On Mon, 14 May 2007 18:04:00 +0200, Antonino Ingargiola wrote:
> Hi Jean!
> 
> 2007/5/14, Jean Delvare <khali@linux-fr.org>:
> 
> > > Sure. On 2.6.21.1:
> > >
> > > via686a-isa-6000
> > > Adapter: ISA adapter
> > > CPU core:  +1.63 V  (min =  +0.06 V, max =  +3.10 V)
> > > +2.5V:     +2.45 V  (min =  +0.06 V, max =  +3.10 V)
> > > I/O:       +3.52 V  (min =  +3.12 V, max =  +3.45 V)   ALARM
> > > +5V:       +5.05 V  (min =  +4.73 V, max =  +5.20 V)
> > > +12V:     +12.30 V  (min = +11.35 V, max = +12.48 V)
> > > CPU Fan:     0 RPM  (min = 42187 RPM, div = 2)
> > > P/S Fan:  2657 RPM  (min = 42187 RPM, div = 2)          ALARM
> >
> > Hint: increase the fan clock dividers to 4.
> 
> I've not found an obvious way to set it in sensors.conf. Could you
> point me to some doumentation, thanks.

sensors.conf supposedly _is_ the the documentation ;)

Search for the following line in /etc/sensors.conf:

chip "via686a-*"

After this line, add:

set fan1_div 4
set fan2_div 4

Save, quit, run "sensors -s" (as root), that should do it.

> > > while on 2.6.22-rc1:
> > >
> > > via686a-i2c-9191-6000
> > >  ERROR: Can't get adapter or algorithm?!?
> >
> > Ah, interesting. Could it be that the gnome applet quits because it
> > fails to get the adapter name? That wouldn't be very smart, but that's
> > possible.
> 
> Just for the record. Does not quit. It displays on the panel "Chip not found.".
> 
> > This is a side effect of an i2c-core cleanup. This is already fixed in
> > lm_sensors 2.10.3 (libsensors.so.3.1.3). Care to give it a try and
> > confirm it fixes the problem? Note that it might be a bit tricky to get
> > the gnome applet to use your own libsensors rather than the system one.
> > You might need to set the LD_LIBRARY_PATH environment variable before
> > the applet starts, or something similar.
> 
> Luckily the 2.10.3 lm-sensors version is on unstable. The backport to
> Debian Etch was straightforward. Now the applet works again! And the
> P/S fan indicator (you may have noted that showed 0 in the 2.6.22-rc1
> case) works too. Many thanks ;-).

Great, this is good news.

The 0 RPM reading isn't related to the problem you had, this is a
coincidence. 2657 RPM (which your other example shows) is the lowest fan
speed this chip can measure with a fan clock divider of 2, anything
slower is reported as 0 RPM. That's the reason why I suggested
switching the divider to 4.

> Is this new version required only for the via686 chip or should be a
> general advise for Debian Etch users to upgrade to lm-sensors >=
> 2.10.3 for kernels >= 2.6.22?

The problem affects almost all hardware monitoring chips, so this is a
general advice. I've added a note about it on the lm-sensors website.

Alternatively though, you could have recompiled your kernel with
CONFIG_SYSFS_DEPRECATED=y, then lm_sensors 2.10.1 would have worked
fine again. Sorry for not mentioning this before, this might have been
easier than upgrading lm_sensors.

-- 
Jean Delvare
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