Re: fan control

Daniele Boffi
2003-05-02T09:53:53Z

> > > After stop it, try to compile a kernel, it must level up the
> > > temperature and spin up the fan.
> > >
>
> Yes it will, if not please report it to the list.
>

OK, sorry for the confusion. I took the risk of burning my CPU (you succeded in
convincing me that it was not a big risk) and.... since I am wrinting from my
laptop... this means that I didn't burn it.

During some heavy job, the temperature reached 73 C maximum (which is not too
hot, I think). cat /proc/acpi/fan/*/* showed

status: off
status: off
status: off
status: off

at the beginning (about 50 C).
Then, which is strange, it looked like

status: off
status: off
status: on
status: off

when the temperature was more than 62 C and, finally

status: off
status: on
status: on
status: off

The fan was spinning accordingly.
After the end of the job, the fan stopped, temperature went down to 60 C and
acpi reported everything off.
I think everything works as expected, there is some issue with reporting the
status in /proc/acpi, since usually I never see the second state (from bottom)
on if the first one is off.

Opposite (passed) test.
I spinned up the fan at maximum speed (all states on) when temperature was
about 60 C. After temperature went below 48 C the fan stopped and all status
is reported off in /proc/acpi.

As a conclusion, I am now convinced that my bios is smart enough and that
there is no risk of burning the CPU. Acpi does a good job, some report is not
correct (same is happening with processor performance: works fine but is
always reporting status P0).

Daniele