Hi,
Anyone have seen fan turned-on in 90% of the time?
I see that fan power-on when processor is up than 45?C and power-off
when is under 45?C.
Temperature difference between 2 cores is 5?C in idle (Core1=45?C and
Core2=40?C)
Local temperature is ~25?C, kpowersave is in "dynamic mode", my 2 cores
(Intel T7500) is running 94% of the time in idle (checked with "top"),
with clock in 800MHz.
The fan speed is ~2600RPM (always under 3000RPM), and I think that is
not enough to cooling the processor, because is necessary 3min to
decrease 1?C in Core1 and only 40sec to increase 1?C.
I think that is necessary a higher fan speed.
I see this in Debian Lenny (2.6.26-1) and 2.6.28.8 kernel... Maybe in
other versions too.
Regards,
Renato
On Tue, 24 Mar 2009, Renato S. Yamane wrote:
> The fan speed is ~2600RPM (always under 3000RPM), and I think that is
> not enough to cooling the processor, because is necessary 3min to
> decrease 1?C in Core1 and only 40sec to increase 1?C.
>
> I think that is necessary a higher fan speed.
Or a better thermal coupling between the fan assembly and the
processor... this is a weak area on thinkpads.
If your box is still under warranty, I suggest you to use
thinkpad-acpi fan control to keep your fan at level 7 (fastest normal
fan level). If that's not enough, call in for a motherboard
replacement.
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
Henrique de Moraes Holschuh wrote:
> Renato S. Yamane wrote:
>> The fan speed is ~2600RPM (always under 3000RPM), and I think that is
>> not enough to cooling the processor, because is necessary 3min to
>> decrease 1?C in Core1 and only 40sec to increase 1?C.
>>
>> I think that is necessary a higher fan speed.
>
> Or a better thermal coupling between the fan assembly and the
> processor... this is a weak area on thinkpads.
>
> If your box is still under warranty, I suggest you to use
> thinkpad-acpi fan control to keep your fan at level 7 (fastest normal
> fan level). If that's not enough, call in for a motherboard
> replacement.
Updated BIOS to 7LETC5WW (2.25) and...
Fan speed is stabilished in ~3000RPM, temperature go to 42?C and fan
speed still power-on.
# cat /proc/acpi/ibm/fan
status: enabled
speed: 3028
level: auto
# echo level 7 > /proc/acpi/ibm/fan
bash: echo: write error: Invalid argument
How can I change fan level?
Regards,
Renato
On Tue, 24 Mar 2009, Renato S. Yamane wrote:
> # echo level 7 > /proc/acpi/ibm/fan
> bash: echo: write error: Invalid argument
>
> How can I change fan level?
Read the driver documentation, at Documentation/laptops/thinkpad-acpi.txt.
Fan control is locked by default, for hardware safety reasons. The docs
tell you why, how to use the fan control interface, and how to unlock it.
Also, I suggest you get used to the hwmon fan control interface on /sys,
procfs is going away sooner or later...
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh