How to control Thermal zone

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Hi guys,

sorry if this has been already asked,

but I'd like to know if is it possible to control thermal zone in order to turn off my laptop fan when I get my login screen.

I mean, The fan is being correctly turned on and off but only after getting some threshold. When the laptop is turned on and my thermal zone temp is 35C fan is kept on when it could be turned off.

Any tips?

Please, let me know if I'm asking something nonsense.

Thanks in advance.

- --
Regards,

Francisco Figueiredo Jr.
Membro Fundador do Projeto MonoBrasil - MonoBrasil Project Founder Member
http://monobrasil.softwarelivre.org

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"Science without religion is lame;
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Have you loaded acpi fan module? Have you got any device under /proc/acpi/fan? Try to trigger on/off to that device.

cheers
zhen

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Wang, Zhenyu wrote:

|>Hi guys,
|>
|>sorry if this has been already asked,
|>
|>but I'd like to know if is it possible to control thermal zone in order
|>to turn off my laptop fan when I get my login screen.
|>
|>I mean, The fan is being correctly turned on and off but only after
|>getting some threshold. When the laptop is turned on and my thermal zone
|>temp is 35C fan is kept on when it could be turned off.
|>
|>Any tips?
|>
|
|
| Have you loaded acpi fan module? Have you got any device under

/proc/acpi/fan?
| Try to trigger on/off to that device.
|

Hi Wang,

Yes, I get the following under /proc/acpi/fan:

FAN1, FAN2, FAN3.

I played triggering on off on fan.

In fact, I could turn them on! :) I even could check that FAN2 and 3 are fan velocities as when I turned them on they did a much higher noise :)

But unfortunately I couldn't turn them off :(

I tried both echo off > /proc/acpi/fan/FAN1 and echo -n 0 > /proc/acpi/fan/FAN1, but they only turned it on. I mean, when I do echo off, it turns on. So I think that whatever I put is turning them on.

What should I echo to turn them off?

I think that if I learn how to turn it off by playing with acpi/fan it would be very cool!!

Thanks in advance, Wang.

- --
Regards,

Francisco Figueiredo Jr.
Membro Fundador do Projeto MonoBrasil - MonoBrasil Project Founder Member
http://monobrasil.softwarelivre.org

- -------------
"Science without religion is lame;
religion without science is blind."

~ ~ Albert Einstein
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Francisco Figueiredo Jr. wrote:

| Wang, Zhenyu wrote:
| |>Hi guys,
| |>
| |>sorry if this has been already asked,
| |>
| |>but I'd like to know if is it possible to control thermal zone in order
| |>to turn off my laptop fan when I get my login screen.
| |>
| |>I mean, The fan is being correctly turned on and off but only after
| |>getting some threshold. When the laptop is turned on and my thermal zone
| |>temp is 35C fan is kept on when it could be turned off.
| |>
| |>Any tips?
| |>
| |
| |
| | Have you loaded acpi fan module? Have you got any device under
| /proc/acpi/fan?
| | Try to trigger on/off to that device.
| |
|
| Hi Wang,
|
| Yes, I get the following under /proc/acpi/fan:
|
| FAN1, FAN2, FAN3.
|
| I played triggering on off on fan.
|
| In fact, I could turn them on! :) I even could check that FAN2 and 3 are
| fan velocities as when I turned them on they did a much higher noise :)
|
| But unfortunately I couldn't turn them off :(
|
| I tried both echo off > /proc/acpi/fan/FAN1 and echo -n 0 >
| /proc/acpi/fan/FAN1, but they only turned it on. I mean, when I do echo
| off, it turns on. So I think that whatever I put is turning them on.
|
| What should I echo to turn them off?
|

After some google, I finally found:

http://www.novell.com/documentation/suse91/suselinux-adminguide/html/ch09s03.html

"Shows if the fan is currently active. The fan can be activated and deactivated manually by writing 0 (on) or 3 (off) into this file. However, both the ACPI code in the kernel and the hardware (or the BIOS) overwrite this setting when it gets too warm."

I thought something like that could be found in acpi.sf.net. What about it?

At least now I can control my cpu fans!! :D

with a single echo -n 3 in the state and it turns off!! Perfect!

Is this the right value? I mean, it worked, but I could be writing some bogus value. I could confirm that automatic on/off by acpi/bios is working as usual even when I manually turn it on/off.

Again, tanks Wang, for feedback and tip. ;)

Now, I think I have almost everything from my laptop.

The only missing thing is S4! :)

I'm waiting for 2.6.10 patch of software suspend to come up! I'm using 2.6.10rc1.

Good work acpi people!

Thank you very much!

- --
Regards,

Francisco Figueiredo Jr.
Membro Fundador do Projeto MonoBrasil - MonoBrasil Project Founder Member
http://monobrasil.softwarelivre.org

- -------------
"Science without religion is lame;
religion without science is blind."

~ ~ Albert Einstein
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Hi!

You can just echo 1:2:3 > trip_points...
Pavel

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Pavel Machek wrote:

| Hi!
|
|
|>sorry if this has been already asked,
|>
|>but I'd like to know if is it possible to control thermal zone in
|>order
|>to turn off my laptop fan when I get my login screen.
|>
|>I mean, The fan is being correctly turned on and off but only after
|>getting some threshold. When the laptop is turned on and my thermal
|>zone
|>temp is 35C fan is kept on when it could be turned off.
|>
|>Any tips?
|
|
| You can just echo 1:2:3 > trip_points...
| 				Pavel

What do this do?
I don't know trip_points and what their parameters mean. Could you explain it, please?

Thanks in advance.

- --
Regards,

Francisco Figueiredo Jr.
Membro Fundador do Projeto MonoBrasil - MonoBrasil Project Founder Member
http://monobrasil.softwarelivre.org

- -------------
"Science without religion is lame;
religion without science is blind."

~ ~ Albert Einstein
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echo "critical:hot:passive:active1:active2:activeX" > trip_points e.g.:
echo "90:80:45:40:38" > trip_points

means:
90 degree -> critical -> machine should shutdown (e.g. by acpid)
80 degree -> hot -> gets dangerous
45 degree -> passive -> Set CPU frequency, throttling (CPU performance)
down in order to cool system
40 degree -> active1 -> turn on active cooling device 1
This normally is a fan (or an intensity of a fan)
38 degree -> active2 ...

To modifiy the trip points they have to be exported by your BIOS, otherwise those values are ignored ...

echo 5 > polling_frequency is a good idea as well.

However the thermal module still has some bugs (e.g. once you entered passive cooling it always will be displayed in state (but your machine should be fast again)) To track down what's going on compile with CONFIG_ACPI_DEBUG=y
and:
echo 0xFFFF0000 >/proc/acpi/debug_layer
echo 0x00000FFF >/proc/acpi/debug_level
and watch your syslogger output...

Thomas

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patch is at http://bugme.osdl.org/show_bug.cgi?id=3410
Would you help to test it?

thanks
zhen

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