Public bug reported:
The temperature at which the cpu fan starts working is 45C, the turn-off
temperature is 35C which is way too low. My laptop's standard temperature is
about 40C so basically the fan never goes off. Even in the cool basement the
temperature does not get lower than 37C.
The off-setting is unnecessarily low because a centrino can work at 40 - 45 C
without the need of cooling.
The fan can definitely be controlled by linux (unlike described in Bug #42520).
This can be checked at bootup, because while loading gnome, the cpu runs at 1,5
GHz and easily surpasses the 45 C, once gnome is done loading, the cpu goes
down to 600 MHz and the temperature goes down below 35C for a while (until it
reaches the normal working temperature). At this point, while the fan started
working above 45 C it stopped when the temperature dropped to 35 C.
Also, it does not matter whether the laptop is running on battery or not, the
fan behavior is always the same which is not only annoying but bad for the
battery.
I have tried to change this setting via the DSDT but somehow the edited
one was not included in the initrd, the values remained the old ones.
The point is to change the fan-off setting and set the temperature for
it higher, this would solve the problem.
My laptop:
Samsung P30 XVM1500 (newest BIOS installed)
Centrino (Banias) 1,5 GHz
Dapper Drake, newest kernel version available
lm-sensors, powernowd running
sensors are found at boot, sensor limits are set
Thanks a million for help in advance!
** Affects: Ubuntu
Importance: Untriaged
Status: Unconfirmed
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Fan doesn't stop working on a samsung laptop
https://launchpad.net/bugs/52883
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