http://bugzilla.kernel.org/show_bug.cgi?id=13718





--- Comment #9 from russe...@openconcepts.com.au  2009-07-08 12:16:56 ---
Hi,

Thanks for your reply.

In the BIOS the only option is "FAN ON ALWAYS" (or something like that), which
I've switched OFF.

I've attached listings of /sys/class/hwmon and /sys/class/thermal.

The 4 cooling devices are 2 x CPU and 2 x LCD (not sure why there would be 2 x
LCD unless my external monitor is counted too). I read the "type" file to
determine this.

I removed modules: acpi_freq, hwmon, coretemp and it made no difference to the
fan behaviour.

My guess is that the fan is entirely hardware controlled, but there's some
secret override that an OS can perform.

I've tried zeroing the CFAN and SFAN values in the DSDT every time the
temperature is read, and it makes no difference.

I think I read somewhere that Windows puts the DSDT in the registry.  Do you
think there's anything I might find in there (I have to re-load Windows to find
out)?

Any other ideas or suggestions?

Do you need any more info?

Thanks for your help.

regards,
RR

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