Re: swsusp and suspend2 like to overheat my laptop

From: Pavel Machek
Date: Wed Aug 09 2006 - 07:56:41 EST


> > Okay, can you try to leave it up for a week or two (no suspends, no
> > poweroffs) and see what happens?
> I've had this laptop running for a couple of months without shutting down
> and it doesn't have a problem. The only time that I do shut it down


> > > > P4 has thermal protection, so you are actually safe.
> > >
> > > Yeah, but still, the keyboard gets pretty hot too, and I'm actually more
> > > worried about damaging something that is close by than damaging the CPU
> > > itself.
> >
> > If you damage something, machine was misdesigned in the first place.
> agreed, but you never know ;) This laptop is currently my lifeline :)

You'd have good reason to get new one.

> > cat we get contents of /proc/acpi/thermal*/*/* ?
> I'm running after a poweroff (left it running over night in the hotel, and
> I'm still in the hotel).
> $ grep . /proc/acpi/thermal_zone/THRM/*
> /proc/acpi/thermal_zone/THRM/cooling_mode:<setting not supported>
> /proc/acpi/thermal_zone/THRM/cooling_mode:cooling mode: passive
> /proc/acpi/thermal_zone/THRM/polling_frequency:<polling disabled>
> /proc/acpi/thermal_zone/THRM/state:state: ok
> /proc/acpi/thermal_zone/THRM/temperature:temperature: 48 C
> /proc/acpi/thermal_zone/THRM/trip_points:critical (S5): 88 C
> /proc/acpi/thermal_zone/THRM/trip_points:passive: 81 C: tc1=4 tc2=3 tsp=100 devices=0xcf6c2338
> Note thermal_zone/THRM was finished with bash tab completion so they are
> the only things that match the above glob expr.

Ok, so it is the bios doing temperature control up-to 81C. At 81C,
linux should start cooling it, and at 88C, linux should shutdown. At
little higher temperature, hardware should emergency shutdown.

> > How s2ram works would be useful info.
> No idea.

Well, try it :-).

> It does look like something isn't setting up the ACPI power properly on
> resume, and that the CPU is probably in a busy loop while the machine is
> idle. Just a guess.

Fan is not controlled by ACPI. But we may be saving some memory we
should not save, or something like that.
(cesky, pictures)
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