http://bugzilla.kernel.org/show_bug.cgi?id=12998





--- Comment #7 from Sanjoy Mahajan <san...@mit.edu>  2009-04-02 14:57:07 ---
>> Every 20 or S3 suspends, the machine shuts completely off: 

> every 20 what?

Sorry, I meant to type "every 20 or so S3 suspends...".

>> the crescent-moon LED turns on,

> how many LEDs are on in all?

If I have the AC plugged in while suspending, all three LEDs (on the
outside of the case) are on, including the crescent moon.  As soon as I
unplug the AC, only the crescent moon remains on.

>> I had noticed this problem with vanilla 2.6.27.4, and upgraded to
>> 2.6.29 in the hope that it would go away.  But if anything it has
>> become more frequent.

> what do you mean more frequent?

With 2.6.27.4, it happened maybe once per 50 suspends; with 2.6.29 it
happens more frequently, maybe once per 20 suspends.

> This bug is not always reproducible in every S3, is it?

No, unfortunately.  It happens about once every 20 cycles.  It seems
more likely to happen if I have it suspended for longer.  I've never
seen it happen with a 5- or 10-minute suspend; only with suspends
lasting, say, an hour or longer.

> I suspect this may be a thermal problem, please attach the
> /var/log/messages file.

I will attach a current /var/log/messages showing a few suspend/resume
cycles as well as a reboot (I think I rebooted due to one of these
resume failures).

> and make sure there is no fan spinning when the laptop is suspended.

The fan is almost never spinning when I suspend; but when it is, it
always shuts off during the suspend (as far as I remember).  But I'll
listen carefully from now on to be sure.

If the fan is spinning, I cannot turn it off by hand because the T60 fan
is controlled only by the BIOS.  There is nothing under /proc/acpi/fan/
for example (there are two thermal zones under
/proc/acpi/thermal_zone/).

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