Thermal fan on PIIIDME

phil at phil at
Wed Jun 19 23:30:56 CEST 2002

Oh, boy, I'm not sure.  It sounded like the fan was controlled by an
LM87.  What controls the LM87?  It seems obvious to me that the LM87's
must be controlled exclusively through the SMBus.  It's possible that
ACPI (or some other Bios thing?) is controlling the LM87 via the
SMBus, but I'm not an ACPI expert. 


On Wed, Jun 19, 2002 at 10:07:07PM +0100, Chris Rankin wrote:
> --- phil at wrote:
> > It's possible that the initialization function in
> > the LM87 driver in
> > lm-sensors is overriding the settings that the Bios
> > does.
> Ummm, I wonder. I tried setting the thermal fan to
> come on at 30 degrees C, so it came on immediately at
> power up. I noticed that the memory test was running
> slower than usual and then the boot-process "stuck"
> just after the hard disks had been recognised. I had
> to power off and re-enter the BIOS settings. Trying to
> boot at a higher temperature (45 degrees) resulted in
> the fan whirring intermittently and this time it
> managed to boot during one of the thermal fan's quiet
> periods. (I.e. it waited for the fan to stop spinning,
> and then booted!) At the LILO prompt screen, the
> keyboard was unresponsive as long as the thermal fan
> was on, and now that I've booted into Linux the fan
> isn't spinning at all.
> This is starting to sound "interrupt-like", to me. Do
> you think that the thermal fan could be part of the
> ACPI subsystem instead, and not connected to the SMBus
> at all?
> Chris
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Philip Edelbrock -- IS Manager -- Edge Design, Corvallis, OR
   phil at --
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