Re: swsusp and suspend2 like to overheat my laptop


On Wed, 9 Aug 2006, Pavel Machek wrote:

Hi!

A few months ago, I installed suspend2 on my laptop. It worked great for
a few days, when suddenly my laptop started to get very hot and the fan
costantly went off, and then I started getting these:

I take it as "if I keep it for a week powered off, it will not do
this".

Not quite. It's more of, "if I suspend everynight instead of leaving it
running or shutting it down, it will do this" or "if I power off at night
or just leave it running, it will not do this".

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 is
when I'm working on site (which I'm doing now). So I only shutdown the
laptop while traveling. When I came across suspend2 (and later swsusp), I
was excited that I didn't need to restart all my applications when leaving
the place of work and coming back. But After being on site for several
days, and using the suspend to disk, I get a hot CPU. But when I've been
on site while shutting down normally when I leave then I don't have a
problem.


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 :)


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.


$ sudo modprobe ibm_acpi
$ ls /proc/acpi/ibm/
bay bluetooth driver led thermal
beep cmos hotkey light video

No fan there

Does ibm/thermal work?

$ cat /proc/acpi/ibm/thermal
temperatures: not supported

I guess not.


Seems like fan is completely controlled by hardware. What may still
help: either saving or avoiding saving reserved parts of memory. But
this is all magic.

How s2ram works would be useful info.

No idea.

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.

Thanks for the support,

-- Steve

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