From: Guenter Roeck <linux@roeck-us.net>
To: Laszlo Papp <lpapp@kde.org>
Cc: Jean Delvare <jdelvare@suse.de>,
LKML <linux-kernel@vger.kernel.org>,
lm-sensors@lm-sensors.org
Subject: Re: Tachometer speed returned rather than absolute fan speed?
Date: Fri, 7 Mar 2014 10:17:18 -0800 [thread overview]
Message-ID: <20140307181718.GA1027@roeck-us.net> (raw)
In-Reply-To: <CAOMwXhPpObWqd1vR3t+ifKd-_ZbnGTm1TNNUakmVAR3CB=pzTg@mail.gmail.com>
On Fri, Mar 07, 2014 at 03:47:08PM +0000, Laszlo Papp wrote:
> On Fri, Mar 7, 2014 at 3:37 PM, Jean Delvare <jdelvare@suse.de> wrote:
> >> > I'm quite confused. While I admit that the term "tachometer speed" is
> >> > awkward, the max6650 driver is reporting fan speeds in RPM as every
> >> > other hwmon driver. So I really have no idea what you think is wrong.
> >> > What did you think "tachometer speed" was, if not the fan speed? Does
> >> > the max6650 driver not return correct fan speeds for you?
>
> That is some strange behavior. If I do "echo 1 > pwm1_enable; echo 0 >
> pwm1; cat fan1_input", I still see 30 for the connected fan, whereas I
> can see it stopped. Is this an expected behavior? I would expect zero
> as a user.
>
I seem to recall that I had seen that as well, with no fan connected.
Maybe the tachometer registers always read at least '1'. I would think
it is wrong, but we'll have to understand the chip a bit better
to be able to provide a fix. Unless you already have a fix ready,
of course. I'll try to re-test tonight if I find the time.
Guenter
next prev parent reply other threads:[~2014-03-07 18:17 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-07 14:48 Tachometer speed returned rather than absolute fan speed? Laszlo Papp
2014-03-07 15:08 ` Laszlo Papp
2014-03-07 15:25 ` Jean Delvare
2014-03-07 15:31 ` Laszlo Papp
2014-03-07 15:37 ` Jean Delvare
2014-03-07 15:47 ` Laszlo Papp
2014-03-07 18:17 ` Guenter Roeck [this message]
2014-03-08 23:50 ` [lm-sensors] " Guenter Roeck
2014-03-09 6:36 ` Laszlo Papp
2014-03-09 8:04 ` Guenter Roeck
2014-03-09 12:44 ` Laszlo Papp
2014-03-10 9:59 ` Laszlo Papp
2014-03-10 13:26 ` Guenter Roeck
2014-03-10 13:50 ` Laszlo Papp
2014-03-10 15:11 ` Guenter Roeck
2014-03-10 18:00 ` Laszlo Papp
2014-04-08 9:19 ` Pavel Machek
2014-03-10 7:11 ` George Spelvin
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