[Bug 18164] CPU fan not activating on HP NX6125

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Mon Dec 12 12:13:25 UTC 2005


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Ubuntu (laptop) | linux





------- Additional Comments From oei.yungchin at gmail.com  2005-12-12 12:13 UTC -------
I have the same problem on the same hardware. Ubuntu 5.10, kernel version
2.6.12-10-amd64-generic.

It seems that on low cpu-load, the fan is regulated properly. If the cpu heating
occurs 'fast', e.g. when you run "glxgears", the cpu temperature rises with no
fan activity until I explicitly probe the temperature through "cat
/proc/acpi/thermal_zone/TZ1/temperature" (or "acpi -V").

Could it be that hardware alerts at crossing trip-points are not passed to the
acpi-module at higher cpu-loads (too low priority or something like that)?
If I can assist in checking out this bug, please instruct me. I'd like to learn
more about system internals in this way.

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