Fan starts and stops periodically on new Eee

Hi,
unfortunately, there's an annoying flaw with my newly obtained Eee: It's all in all a very nice and useful netbook, and I love the fact that it's both light and quiet, it's barely hearable at all. If the fan starts though, I need earlaps.
The overall temperature is very high also, but I think this is normal with those new netbooks. Usually the temperature is about 60°C. I noticed that the temperature gets higher very easily, and after some time, the fan starts working and it's annoyingly loud. After some time, even with small applications running the fan would start, makes some noise, and quits afterwards until some minutes later it will start again and again and so on ...
Usually, I install everything that is mentioned in the Wiki that has something to do with power control, e.g. cpufreq, pm-utils, acpid but I still suffer from nuisance. I tried both ondemand and conservative governor, though the fan doesn't mind. I wouldn't mind working with low CPU speed if just the fan wouldn't start even when I just chat or browse the web.
If this procedure starts at one time, it's difficult that the fan would rest even if the temperature is low again. Once I want to play a video on YouTube or something similiar, the fan will overtune the video. I can't even imagine what I do that needs so much resources. If I observe the temperature in /proc/acpi/thermal_zone/TZ00/temperature, the temperature jumps some degrees higher just when I click some widgets (or write this text) ...
Has anyone an idea what I could do to get a little bit of silence? I can't imagine that this behaviour is normal, and I would appreciate any hints.
Sorry you probably notice that I'm a little bit annoyed of the fan.
In the end, if nothing helps I'm thinking about buying a cooling pad for notebooks, if I get the chance ...

I found the granularity of BIOS-level fan control to be quite lacking too.
The kernel (eeepc-laptop module) provides fan control in /sys/class/hwmon/hwmon0 by default. There are several interfaces. Usage examples:
pwm1_enable shows if software-side fan control is enabled (1) or if the BIOS is handling the fan (0). Changing fan speed won't work if this is 0. (i.e. cat /sys/class/hwmon0/pwm1_enable reports 0 -> disabled; you could enable it with echo 1 > /sys/class/hwmon0/pwm1_enable).
pwm1 allows to change fan speed. The values range from 0 (fan off) to 255 (full speed, 12V).
fan1_input shows the current RPM if a fan is connected. You can only read from this interface. Its useful to check all of these in the each of the hwmon folders to find out if there is actually a fan connected to the fan controller (they often have more ports than mainboard manufacturers use).
There are various applications to utilize these in order to tweak fan control to your liking, a lightweight one is the fancontrol daemon. If you don't mind 'some' gnome dependencies, eee-control has an awesome fan control algorithm too (options -> smart fan control).
laptop-mode and acpi-eeepc-generic don't feature fan control.
The cpufreq utility has only a marginal impact, as it changes the FSB/CPU multiplier and the Atom has a measly TDP of 2,5W compared to the chipset's 6W - the fan is primarily need to cool the northbridge. Side note: There is an interface to control FSB clock rate: /sys/devices/platform/eeepc/cpufv. 2 is 100MHz, 1 is 133MHz, 0 is 140MHz. eee-control manage this too, it's the "Performance" setting. There also is a laptop-mode add-in to control it dependant on AC status.
Last edited by Malstrond (2009-07-21 23:29:33)

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