fan

fan

[joerg.beyer-htSm2yLGOjU]

Hi,

I am unsure if the fan handling on my laptop works, so I made
a experiment. I wanted to switch the fan on and off via
echo -n 0 > /proc/acpi/fan/FAN/state
to switch the fan off and echo -n 1 >.../state to switch the fan on.
That did not work. First of all: cat /proc/acpi/fan/FAN/state
always said that "status:     on" - but the fan some times
on, some times off.

For better debugging, I added a printk in fan.c:acpi_fan_write_state,
as you can see below. I echo'd the values you can see. The fan
began to work when I said "echo -n 3> /proc/a/f/F/state".


from var log messages:
Sep  1 23:05:03 wally kernel: fan_write 0, state_string '0'
Sep  1 23:05:22 wally kernel: fan_write 1, state_string '1'
Sep  1 23:05:22 wally kernel: acpi_bus-0472 [06] acpi_bus_set_power    : Device does not support D1
Sep  1 23:06:27 wally kernel: fan_write 3, state_string '3'
Sep  1 23:06:27 wally kernel: acpi_power-0363 [07] acpi_power_transition : Error transitioning device [FAN] to D3
Sep  1 23:06:27 wally kernel: acpi_bus-0521 [06] acpi_bus_set_power    : Error transitioning device [FAN] to D3
Sep  1 23:06:42 wally kernel: fan_write 1, state_string '1'
Sep  1 23:06:42 wally kernel: acpi_bus-0472 [06] acpi_bus_set_power    : Device does not support D1
Sep  1 23:06:50 wally kernel: fan_write 3, state_string '3'
Sep  1 23:06:55 wally kernel: fan_write 0, state_string '0'

I am using linux-2.4.20-pre5 with latest apci patch, everthing enabled,
on a laptop. If you need more input, please ask.

Here my questions:

is echo -n 0 >/proc/acpi/fan/FAN/state
ment to stop the fan and
is echo -n 1 >/proc/acpi/fan/FAN/state
ment to start the fan?

What does the "Error transitioning device [FAN] to D3" mean?

    TIA
    Joerg




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Re: fan

[Arndt Schoenewald]

On Sun, Sep 01, 2002 at 11:33:37PM +0200, joerg.beyer-htSm2yLGOjU@public.gmane.org wrote:
> [...]
> Here my questions:
> 
> is echo -n 0 >/proc/acpi/fan/FAN/state
> ment to stop the fan and
> is echo -n 1 >/proc/acpi/fan/FAN/state
> ment to start the fan?

No, as I understand it, "echo -n 0 >/proc/acpi/fan/FAN/state" should
start the fan and "echo -n 3 >/proc/acpi/fan/FAN/state" should stop it.

But, actually, on my system the "3" doesn't stop the fan but makes it
turn slower (and less noisy); "0" turns it back to full speed.

(I have a Gericom 1st Supersonic M6-T laptop.)

> What does the "Error transitioning device [FAN] to D3" mean?

Don't know for sure, sorry, but it seems that the system fails to remove
the power to the fan.

Good luck,
Arndt


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