[lm-sensors] Module asus_atk0110 - Fan speed often shows zero instead of correct value

[lm-sensors] Module asus_atk0110 - Fan speed often shows zero instead of correct value

[Simon Sandström]

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Hello

I'm having trouble with the asus_atk0110 kernel module. The speed for fan3
(CHASSI2 FAN) often just shows zero, but once in awhile it shows the actual
speed of the fan. I've checked the fan, and it does spin at all time and it
also shows the correct speed at all time in BIOS.

There is also a slight delay when reading the input with "cat
/sys/class/hwmon/hwmon0/fan3_input". When the speed is zero, it takes
approx. 0.3s and when it shows the correct speed (700RPM) it takes 0.1s.
All other fan inputs respond with no delay (0.001s).

$ uname -a
Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.46-1 x86_64 GNU/Linux

$ lsmod | grep asus_atk0110
asus_atk0110           17297  0

$ sensors --version
sensors version 3.3.2 with libsensors version 3.3.2

Does anyone else have this problem, or any similar problem? I could just
connect the fan to fan4 and ignore fan3, but for some reason the minimum
speed for fan4 is 800RPM (the others are 600RPM), and I like my fans
running at 700RPM..

Thanks

Simon

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Re: [lm-sensors] Module asus_atk0110 - Fan speed often shows zero instead of correct value

[Guenter Roeck]

On Tue, Jul 16, 2013 at 07:04:39PM +0200, Simon Sandström wrote:
> Hello
> 
> I'm having trouble with the asus_atk0110 kernel module. The speed for fan3
> (CHASSI2 FAN) often just shows zero, but once in awhile it shows the actual
> speed of the fan. I've checked the fan, and it does spin at all time and it
> also shows the correct speed at all time in BIOS.
> 
> There is also a slight delay when reading the input with "cat
> /sys/class/hwmon/hwmon0/fan3_input". When the speed is zero, it takes
> approx. 0.3s and when it shows the correct speed (700RPM) it takes 0.1s.
> All other fan inputs respond with no delay (0.001s).
> 
> $ uname -a
> Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.46-1 x86_64 GNU/Linux
> 
> $ lsmod | grep asus_atk0110
> asus_atk0110           17297  0
> 
> $ sensors --version
> sensors version 3.3.2 with libsensors version 3.3.2
> 
> Does anyone else have this problem, or any similar problem? I could just
> connect the fan to fan4 and ignore fan3, but for some reason the minimum
> speed for fan4 is 800RPM (the others are 600RPM), and I like my fans
> running at 700RPM..
> 
This is all determined by ACPI, not by the driver. So I don't think there is
anything we can do about it.

Can you set the minimum fan speed in the BIOS ?

Guenter

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Re: [lm-sensors] Module asus_atk0110 - Fan speed often shows zero instead of correct value

[Jean Delvare]

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Re: [lm-sensors] Module asus_atk0110 - Fan speed often shows zero instead of correct value

[Simon Sandström]

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Hello! Thanks for the reply.

2013/7/18 Jean Delvare <khali@linux-fr.org>

> Hi Simon,
>
> On Tue, 16 Jul 2013 19:04:39 +0200, Simon Sandström wrote:
> > I'm having trouble with the asus_atk0110 kernel module. The speed for
> fan3
> > (CHASSI2 FAN) often just shows zero, but once in awhile it shows the
> actual
> > speed of the fan. I've checked the fan, and it does spin at all time and
> it
> > also shows the correct speed at all time in BIOS.
>
> Which motherboard is it? On some boards passing module parameter
> new_if=1 helps, you may want to give it a try.


> Also, the asus_atk0110 driver heavily relies on the BIOS, so a BIOS
> update may help.
>

Asus P5K Premium. I'm pretty sure it has the latest BIOS version (can't
check now, see below). I tried using the option new_if=1 and it just
screwed up all readings. For example it now shows 1.54V for all voltages,
1500~RPM for all fans and 150°C for both CPU and MB, which is way off.

>
> Note that the fact that the speed in the BIOS is right doesn't
> necessarily mean that the BIOS is right and the asus_atk0110 Linux
> kernel driver is wrong. If the fan has any form of automatic speed
> control applied, it might simply be that the BIOS keeps your machine
> busy enough for the fan to stay in the measurable speed area. Did you
> enable fan speed control in the BIOS? Does the problem go away if you
> (temporarily) disable it?


> For 3-pin fans, speed measurement is easy and reliable when the fan
> runs at full speed. However as soon as control is applied, measurement
> becomes harder. This is true when PWM control is used, but even more
> when DC control is used: the speed signal weakens as the voltage is
> lowered, and after some point it's difficult for the monitoring chip to
> distinguish between the speed signal and the noise.
>
> So maybe your fan is spinning at the border between readable and
> unreadable.
>

Yes, I have fan control enabled both for CPU and chassi fans. I can not
disable it at the moment as the server is running some services which needs
to be up. CPU is set to automatic and the chassi fans is set to run at 70%
duty. Both chassi fans are the same model, but only one of them is giving
strange readings with lm-sensors. So I don't think there is a problem
because of the speed control.

I will try to disable the fan control and also try to switch the
connectionof the two chassi fans to see if I can come up with anything.


> > There is also a slight delay when reading the input with "cat
> > /sys/class/hwmon/hwmon0/fan3_input". When the speed is zero, it takes
> > approx. 0.3s and when it shows the correct speed (700RPM) it takes 0.1s.
> > All other fan inputs respond with no delay (0.001s).
>
> Not necessarily surprising. I don't know how exactly the Asus BIOS code
> works, but I can imagine that they try harder when the fan speed they
> read at first looks suspicious. This would explain the extra delay.
>
> > (...)
> > Does anyone else have this problem, or any similar problem? I could just
> > connect the fan to fan4 and ignore fan3, but for some reason the minimum
> > speed for fan4 is 800RPM (the others are 600RPM), and I like my fans
> > running at 700RPM..
>
> How do you keep them at exactly 700 RPM?
>

See above.


>
> --
> Jean Delvare
>

Simon

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Re: [lm-sensors] Module asus_atk0110 - Fan speed often shows zero instead of correct value

[Jean Delvare]

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Re: [lm-sensors] Module asus_atk0110 - Fan speed often shows zero instead of correct value

[Simon Sandström]

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2013/7/18 Jean Delvare <khali@linux-fr.org>

> On Thu, 18 Jul 2013 15:00:23 +0200, Simon Sandström wrote:
> > 2013/7/18 Jean Delvare <khali@linux-fr.org>
> > > Also, the asus_atk0110 driver heavily relies on the BIOS, so a BIOS
> > > update may help.
> >
> > Asus P5K Premium. I'm pretty sure it has the latest BIOS version (can't
> > check now, see below).
>
> You can check the BIOS version of a running system, just read it
> from /sys/class/dmi/id/bios_version. Then compare with what Asus's
> website says is the latest.
>

Oh, I didn't know that. I have version 1101, which is the latest according
to their website.

>
> > I tried using the option new_if=1 and it just
> > screwed up all readings. For example it now shows 1.54V for all voltages,
> > 1500~RPM for all fans and 150°C for both CPU and MB, which is way off.
>
> OK, forget about it then.
>
> > > (...)
> > > For 3-pin fans, speed measurement is easy and reliable when the fan
> > > runs at full speed. However as soon as control is applied, measurement
> > > becomes harder. This is true when PWM control is used, but even more
> > > when DC control is used: the speed signal weakens as the voltage is
> > > lowered, and after some point it's difficult for the monitoring chip to
> > > distinguish between the speed signal and the noise.
> > >
> > > So maybe your fan is spinning at the border between readable and
> > > unreadable.
> >
> > Yes, I have fan control enabled both for CPU and chassi fans. I can not
> > disable it at the moment as the server is running some services which
> needs
> > to be up. CPU is set to automatic and the chassi fans is set to run at
> 70%
> > duty. Both chassi fans are the same model, but only one of them is giving
> > strange readings with lm-sensors. So I don't think there is a problem
> > because of the speed control.
>
> Keep in mind that the signal/noise ratio is somewhat model-specific and
> even varies from one fan sample to the next.


I tried switching the two fans. Same readings as before: fan2_input showed
700 RPM and fan3_input showed 0 RPM (occasionally 700 RPM). So there seems
to be a problem with the actual motherboard (or, less likely, the
asus_atk0110 module)? I have not tried disabling the speed control in BIOS
yet though.

On another note, how come they set the minimum fan speed for chassi fan 3
(fan4_input) to 800 RPM while the other two chassi fans has a lower limit
of 600 RPM? As I understand, this limit is set by the hardware and can not
be changed?

>


> > I will try to disable the fan control and also try to switch the
> > connectionof the two chassi fans to see if I can come up with anything.
>
> Yes, good idea.
>
> --
> Jean Delvare
>

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Re: [lm-sensors] Module asus_atk0110 - Fan speed often shows zero instead of correct value

[Jean Delvare]

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